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[#]: subject: "How To Boot Into Rescue Mode Or Emergency Mode In Ubuntu 22.04 / 20.04 / 18.04"
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[#]: via: "https://ostechnix.com/how-to-boot-into-rescue-mode-or-emergency-mode-in-ubuntu-18-04/"
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[#]: author: "sk https://ostechnix.com/author/sk/"
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[#]: collector: "lkxed"
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[#]: translator: "robsean"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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How To Boot Into Rescue Mode Or Emergency Mode In Ubuntu 22.04 / 20.04 / 18.04
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======
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This tutorial explains how to boot into **rescue mode** or **emergency mode**in Ubuntu 22.04, 20.04 and 18.04 LTS editions.
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As you might already know, **Runlevels** are replaced with **Systemd targets** in many Linux distributions such as RHEL 7 / RHEL 8 and Ubuntu 16.04 LTS and newer versions. For more details about runlevels and systemd target, refer to [this guide][1].
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This guide is specifically written for Ubuntu, however the steps given below should work on most Linux distributions that use **Systemd** as the default service manager.
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Before getting into the topic, let us have a brief understanding about what is rescue mode and emergency mode and what is the purpose of these both modes.
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### What Is Rescue Mode?
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The **rescue mode** is equivalent to **single user mode** in Linux distributions that use **SysV** as the default service manager. In rescue mode, all local filesystems will be mounted, only some important services will be started. However, no normal services (E.g network services) won't be started.
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The rescue mode is helpful in situations where the system can't boot normally. Also, we can perform some important rescue operations, such as [reset root password][2], in rescue mode.
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### What Is Emergency Mode?
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In contrast to the rescue mode, nothing is started in the **emergency mode**. No services are started, no mount points are mounted, no sockets are established, nothing. All you will have is just a **raw shell**. Emergency mode is suitable for debugging purposes.
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First, we will see how to boot into rescue mode and emergency mode in Ubuntu 22.04 and 20.04 LTS distributions. The procedure for entering rescue mode in Ubuntu 22.04 and 20.04 LTS is exactly the same!
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### Boot Into Rescue Mode In Ubuntu 22.04 / 20.04 LTS
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We can boot into rescue mode in two ways.
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#### Method 1
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Power on your Ubuntu system. Hit the ESC key right after the BIOS logo disappears to display the Grub menu.
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In the GRUB menu, choose the first entry and press **"e"** to edit it.
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![GRUB Menu In Ubuntu 22.04 / 20.04 LTS][3]
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Hit the DOWN arrow and find the line that starts with the word **"linux"** and add the following line at the end of it. To reach the end, just press **CTRL+e** or use the **END** key or **LEFT/RIGHT** arrows in your keyboard.
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```
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systemd.unit=rescue.target
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```
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![Edit Grub Boot Menu Entries To Enter Into Rescue Mode In Ubuntu 22.04 / 20.04 LTS][4]
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After adding the above line, hit **Ctrl+x** or**F10** to boot into rescue mode.
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After a few seconds, you will be landed in the rescue mode (single user mode) as root user. You will be prompted to press ENTER to enter the maintenance mode.
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Here is how rescue mode looks like in Ubuntu 22.04 / 20.04 LTS systems:
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![Boot Into Rescue Mode In Ubuntu 22.04 / 20.04 LTS][5]
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Now do whatever you want to do in the rescue mode. You may need to mount the root (**/**) file system in read/write mode before doing any operations in rescue mode.
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```
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mount -n -o remount,rw /
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```
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![Mount Root File System In Read Write Mode In Ubuntu 22.04 / 20.04 LTS][6]
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Once done, press **"Ctrl+d"** to boot into normal mode. Alternatively, you can type any one of the following commands to boot into normal mode.
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```
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systemctl default
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```
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Or,
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```
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exit
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```
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If you want to reboot the system instead of booting into normal mode, enter:
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```
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systemctl reboot
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```
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#### Method 2
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In this method, you don't need to edit the grub boot menu entries.
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Power on the system and choose **"Advanced options for Ubuntu"** from the Grub boot menu.
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![Choose Advanced Options For Ubuntu From Grub Boot Menu][7]
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Next, you will see the list of available Ubuntu versions with Kernel versions. Choose the **"Recovery mode"** in the grub boot menu in Ubuntu.
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![Choose Recovery Mode In Grub Boot Menu In Ubuntu 22.04 / 20.04 LTS][8]
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After a few seconds, you will see the Ubuntu recovery menu. From the recovery menu, choose **"Drop to root shell prompt"** option and hit the ENTER key.
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![Enter Into Root Shell Prompt In Ubuntu 22.04 / 20.04 LTS][9]
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Now you will be landed in the rescue mode.
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![Ubuntu Maintenance Mode][10]
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Mount the root (**/**) file system in read/write mode by entering the following command:
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```
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mount -n -o remount,rw /
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```
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![Mount Root File System In Read Write Mode In Ubuntu][11]
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Do whatever you want to do in the rescue mode.
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Once done, type exit to return back to the recovery menu.
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```
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exit
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```
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Finally, choose **"Resume normal boot"** option and hit the ENTER key.
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![Boot Into Normal Mode In Ubuntu][12]
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Press ENTER key again to exit recovery mode and continue booting into normal mode.
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![Exit The Recovery Mode In Ubuntu][13]
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If you don't want to boot into normal mode, type **"reboot"** and press ENTER from the maintenance mode to restart your system.
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### Boot Into Emergency Mode In Ubuntu 22.04 / 20.04 LTS
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When the GRUB boot menu appears, press **"e"** to edit it.
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![GRUB Menu In Ubuntu 22.04 / 20.04 LTS][14]
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Find the line that starts with the word **"linux"** and add the following line at the end of it.
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```
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systemd.unit=emergency.target
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```
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![Edit Grub Boot Menu Entries To Enter Into Emergency Mode In Ubuntu 22.04 / 20.04 LTS][15]
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After adding the above line, hit **Ctrl+x** or**F10** to boot into emergency mode.
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After a few seconds, you will be landed in the emergency mode as `root` user. You will be prompted to press ENTER to enter the maintenance mode.
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Here is how emergency mode looks like in Ubuntu 22.04 / 20.04 LTS system:
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![Boot Into Emergency Mode In Ubuntu 22.04 / 20.04 LTS][16]
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Now do whatever you want to do in the emergency mode. You may need to mount the root (**/**) file system in read/write mode before doing any operations in this mode.
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```
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mount -n -o remount,rw /
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```
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Once done, press **"Ctrl+d"** to boot into normal mode. Alternatively, you can type any one of the following commands to boot into normal mode.
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```
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systemctl default
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```
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Or,
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```
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exit
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```
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If you want to reboot the system instead of booting into normal mode, enter:
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```
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systemctl reboot
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```
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### Boot Into Rescue Mode In Ubuntu 18.04 LTS
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Boot your Ubuntu system. When the Grub menu appears, choose the first entry and press **e** to edit. (To reach the end, just press **CTRL+e** or use the END key or LEFT/RIGHT arrows in your keyboard):
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![Grub Menu][17]
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If you don't see the Grub menu, just hit ESC key right after the BIOS logo disappears.
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Find the line that starts with word **"linux"**and add the following line at the end of that line (To reach the end, just press **CTRL+e** or use the END key or LEFT/RIGHT arrows in your keyboard):
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```
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systemd.unit=rescue.target
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```
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![Edit Grub Menu][18]
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Once you added the above line, just press **CTRL+x** or **F10** to continue to boot into rescue mode. After a few seconds, you will be landed in the rescue mode (single user mode) as root user.
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Here is how rescue mode looks like in Ubuntu 18.04 LTS server:
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![Ubuntu Rescue Mode][19]
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Next, type the following command to mount root (**/**) file system into read/write mode.
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```
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mount -n -o remount,rw /
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```
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### Boot Into Emergency Mode
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Booting your Ubuntu into emergency is as same as above method. All you have to do is replace **"systemd.unit=rescue.target"** with **"systemd.unit=emergency.target"** when editing grub menu.
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![Edit Grub Menu][20]
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Once you added "systemd.unit=emergency.target", press **Ctrl+x** or **F10** to continue booting into emergency mode.
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![Ubuntu Emergency Mode][21]
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Finally, you can mount root filesystem into read/write mode with command:
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```
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mount -n -o remount,rw /
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```
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### Switch Between Rescue And Emergency Modes
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If you are in rescue mode, you don't have to edit the grub boot entry as I mentioned above. Instead, just type the following command to switch to emergency mode instantly:
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```
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systemctl emergency
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```
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Similarly, to switch from emergency to rescue mode, type:
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```
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systemctl rescue
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```
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### Conclusion
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You know now what is rescue and emergency modes and how to boot into those modes in Ubuntu 22.04, 20.04 and 18.04 LTS systems. Like I already mentioned, the steps provided here will work on many recent Linux versions that uses Systemd.
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--------------------------------------------------------------------------------
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via: https://ostechnix.com/how-to-boot-into-rescue-mode-or-emergency-mode-in-ubuntu-18-04/
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作者：[sk][a]
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选题：[lkxed][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://ostechnix.com/author/sk/
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[b]: https://github.com/lkxed
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[1]: https://ostechnix.com/check-runlevel-linux/
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[2]: https://ostechnix.com/how-to-reset-or-recover-root-user-password-in-linux/
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[3]: https://ostechnix.com/wp-content/uploads/2022/05/GRUB-Menu-In-Ubuntu-22.04-LTS.png
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[4]: https://ostechnix.com/wp-content/uploads/2022/05/Edit-Grub-Boot-Menu-Entries-To-Enter-Into-Rescue-Mode-In-Ubuntu-22.04-LTS.png
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[5]: https://ostechnix.com/wp-content/uploads/2022/05/Boot-Into-Rescue-Mode-In-Ubuntu-22.04.png
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[6]: https://ostechnix.com/wp-content/uploads/2022/05/Mount-Root-File-System-In-Read-Write-Mode-In-Ubuntu.png
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[7]: https://ostechnix.com/wp-content/uploads/2022/05/Choose-Advanced-Options-For-Ubuntu-From-Grub-Boot-Menu.png
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[8]: https://ostechnix.com/wp-content/uploads/2022/05/Choose-Recovery-Mode-In-Grub-Boot-Menu-In-Ubuntu.png
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[9]: https://ostechnix.com/wp-content/uploads/2022/05/Enter-Into-Root-Shell-Prompt-In-Ubuntu.png
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[10]: https://ostechnix.com/wp-content/uploads/2022/05/Ubuntu-Maintenance-Mode.png
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[11]: https://ostechnix.com/wp-content/uploads/2022/05/Mount-Root-File-System-In-Read-Write-Mode-In-Ubuntu-1.png
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[12]: https://ostechnix.com/wp-content/uploads/2022/05/Boot-Into-Normal-Mode-In-Ubuntu.png
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[13]: https://ostechnix.com/wp-content/uploads/2022/05/Exit-The-Recovery-Mode-In-Ubuntu.png
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[14]: https://ostechnix.com/wp-content/uploads/2022/05/GRUB-Menu-In-Ubuntu-22.04-LTS.png
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[15]: https://ostechnix.com/wp-content/uploads/2022/05/Edit-Grub-Boot-Menu-Entries-To-Enter-Into-Emergency-Mode-In-Ubuntu.png
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[16]: https://ostechnix.com/wp-content/uploads/2018/12/Boot-Into-Emergency-Mode-In-Ubuntu-20.04-LTS.png
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[17]: https://ostechnix.com/wp-content/uploads/2018/12/Grub-menu.png
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[18]: https://ostechnix.com/wp-content/uploads/2018/12/Edit-grub-menu.png
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[19]: https://ostechnix.com/wp-content/uploads/2018/12/Ubuntu-rescue-mode.png
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[20]: https://ostechnix.com/wp-content/uploads/2018/12/emergency-mode.png
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[21]: https://ostechnix.com/wp-content/uploads/2018/12/emergency-mode-1.png
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@ -0,0 +1,273 @@
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[#]: subject: "How To Boot Into Rescue Mode Or Emergency Mode In Ubuntu 22.04 / 20.04 / 18.04"
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[#]: via: "https://ostechnix.com/how-to-boot-into-rescue-mode-or-emergency-mode-in-ubuntu-18-04/"
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[#]: author: "sk https://ostechnix.com/author/sk/"
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[#]: collector: "lkxed"
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[#]: translator: "robsean"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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如何在 Ubuntu 22.04 / 20.04 / 18.04 中启动到 <ruby>救援<rt>Rescue</rt></ruby> 模式 或 <ruby>紧急<rt>Emergency</rt></ruby> 模式
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======
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这篇教程将介绍如何在 Ubuntu 22.04、20.04 和 18.04 LTS 版本中启动到 <ruby>救援<rt>Rescue</rt></ruby> 模式 或 <ruby>紧急<rt>Emergency</rt></ruby> 模式。
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你可能已经知道，在 Linux 发行版中 **<ruby>运行等级<rt>Runlevels</rt></ruby>** 已经被 **<ruby>系统目标<rt>Systemd targets</rt></ruby>** 所替代，例如， RHEL 7 、RHEL 8 、Ubuntu 16.04 LTS 及其更新的版本。更多关于 <ruby>运行等级<rt>Runlevels</rt></ruby> 和 <ruby>系统目标<rt>Systemd targets</rt></ruby> 的信息，参考 [这篇指南][1] 。
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这篇指南是针对 Ubuntu 编写的，但是，下面所给的步骤应该也适用于大多数使用 **Systemd** 作为默认服务管理器的 Linux 发行版。
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在进入主题前，让我们简单的理解：什么是 <ruby>救援<rt>rescue</rt></ruby> 模式 和 <ruby>紧急<rt>Emergency</rt></ruby> 模式，以及这两种模式的目的是什么。
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### 什么是 <ruby>救援<rt>rescue</rt></ruby> 模式？
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在 Linux 发行版中，<ruby>救援<rt>rescue</rt></ruby> 模式 等效于 <ruby>单用户<rt>single user</rt></ruby> 模式，它使用 **SysV** 作为默认的服务器管理器。在 <ruby>救援<rt>rescue</rt></ruby> 模式 中，将挂载所有的本地文件系统，将仅启动一些重要的服务。但是，不会启动一般的服务 (例如，网络服务)。
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<ruby>救援<rt>rescue</rt></ruby> 模式 在不能正常启动系统的情况下是很有用的。此外，我们可以在 <ruby>救援<rt>rescue</rt></ruby> 模式 下执行一些重要的 <ruby>救援<rt>rescue</rt></ruby> 操作，例如，[重新设置 root 密码][2] 。
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### 什么是 <ruby>紧急<rt>Emergency</rt></ruby> 模式？
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与 <ruby>救援<rt>rescue</rt></ruby> 模式相比， 在 <ruby>紧急<rt>Emergency</rt></ruby> 模式中，不会启动任何的东西。不会启动服务，不会挂载挂载点，不会建立套接字，什么都不会启动。你将所拥有的只是一个 **原始的 shell** 。<ruby>紧急<rt>Emergency</rt></ruby> 模式适用于调试目的。
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首先，我们将看到如何在 Ubuntu 22.04 和 20.04 LTS 发行版中启动到 <ruby>救援<rt>Rescue</rt></ruby> 模式 或 <ruby>紧急<rt>Emergency</rt></ruby> 模式。在 Ubuntu 22.04 和 20.04 LTS 中进入 <ruby>救援<rt>rescue</rt></ruby> 模式 的过程是完全相同的！
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### 在 Ubuntu 22.04 / 20.04 LTS 中启动到 <ruby>救援<rt>rescue</rt></ruby> 模式
|
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我们可以使用两种方法来启动到 <ruby>救援<rt>rescue</rt></ruby> 模式。
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#### 方法 1
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打开你的 Ubuntu 系统。在 BIOS 徽标出现后，按下 ESC 按键来显示 GRUB 菜单。
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在 GRUB 菜单中，选择第一项，并按下 **"e"** 按键来编辑它。
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|
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![GRUB Menu In Ubuntu 22.04 / 20.04 LTS][3]
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按下 **下箭头** 按键，并找到以单词 **"linux"** 开头的一行代码，并在其结尾处添加下面的一行代码。为到达其结尾处，只需要按下 **CTRL+e** 组合键，或使用你键盘上的 **END** 按键或 **左箭头/右箭头** 按键。
|
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|
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```
|
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systemd.unit=rescue.target
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```
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![Edit Grub Boot Menu Entries To Enter Into Rescue Mode In Ubuntu 22.04 / 20.04 LTS][4]
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在添加上面的代码行后，按下 **Ctrl+x** 组合键 或按下 **F10** 按键来启动到 <ruby>救援<rt>rescue</rt></ruby> 模式.
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数秒后，你将作为 root 用户来登陆到 <ruby>救援<rt>rescue</rt></ruby> 模式 (<ruby>单用户<rt>single user</rt></ruby> 模式) 。将会提示你按下 <ruby>回车<rt>ENTER</rt></ruby> 按键来进入维护模式。
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下图是 Ubuntu 22.04 / 20.04 LTS 系统的 <ruby>救援<rt>rescue</rt></ruby> 模式 的样子：
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|
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![Boot Into Rescue Mode In Ubuntu 22.04 / 20.04 LTS][5]
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现在，在 <ruby>救援<rt>rescue</rt></ruby> 模式 中做你想做的任何事。在 <ruby>救援<rt>rescue</rt></ruby> 模式 中，在你执行任何操作前，你可能需要以 读/写 模式 的方式来挂载 root (**/**) 文件系统。
|
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|
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```
|
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mount -n -o remount,rw /
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```
|
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|
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![Mount Root File System In Read Write Mode In Ubuntu 22.04 / 20.04 LTS][6]
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在完成后，按下 **"Ctrl+d"** 组合键来启动到正常模式。或者，你可以输入下面的任意一个命令来启动到正常模式。
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```
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systemctl default
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```
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或者，
|
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|
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```
|
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exit
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```
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如果你想重新启动系统，而不是启动到正常的模式，输入：
|
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```
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systemctl reboot
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```
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#### 方法 2
|
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|
||||
在这种方法中，你不需要编辑 GRUB 启动菜单项目。
|
||||
|
||||
打开系统电源，并从 GRUB 启动菜单中选择 <ruby>Ubuntu 高级选项<rt>Advanced options for Ubuntu</rt></ruby>。
|
||||
|
||||
![Choose Advanced Options For Ubuntu From Grub Boot Menu][7]
|
||||
|
||||
接下来，你将看到一个带有内核版本的可用的 Ubuntu 版本的列表。在 Ubuntu 中的 GRUB 启动菜单中选择 <ruby>恢复<rt>Recovery</rt></ruby> 模式。
|
||||
|
||||
![Choose Recovery Mode In Grub Boot Menu In Ubuntu 22.04 / 20.04 LTS][8]
|
||||
|
||||
数秒后，你将看到 Ubuntu 的 <ruby>恢复<rt>Recovery</rt></ruby> 菜单。从 <ruby>恢复<rt>Recovery</rt></ruby> 菜单中，选择 **<ruby>进入 root 的 shell 提示符<rt>Drop to root shell prompt</rt></ruby>** 选项 ，并按下 <ruby>回车<rt>ENTER</rt></ruby> 按键。
|
||||
|
||||
![Enter Into Root Shell Prompt In Ubuntu 22.04 / 20.04 LTS][9]
|
||||
|
||||
现在，你将登陆到 <ruby>救援<rt>rescue</rt></ruby> 模式。
|
||||
|
||||
![Ubuntu Maintenance Mode][10]
|
||||
|
||||
通过输入下面的命令来 以 读/写 模式的方式 来挂载 root (**/**) 文件系统：
|
||||
|
||||
```
|
||||
mount -n -o remount,rw /
|
||||
```
|
||||
|
||||
![Mount Root File System In Read Write Mode In Ubuntu][11]
|
||||
|
||||
在 <ruby>救援<rt>rescue</rt></ruby> 模式 中做你想做的任何事。
|
||||
|
||||
在完成后，输入 **exit** 来返回到 <ruby>恢复<rt>Recovery</rt></ruby> 菜单。
|
||||
|
||||
```
|
||||
exit
|
||||
```
|
||||
|
||||
最后，选择 **<ruby>救援正常启动<rt>Resume normal boot</rt></ruby>** 选项，并按下 <ruby>回车<rt>ENTER</rt></ruby> 按键。
|
||||
|
||||
![Boot Into Normal Mode In Ubuntu][12]
|
||||
|
||||
再次按下 <ruby>回车<rt>ENTER</rt></ruby> 按键来退出 <ruby>恢复<rt>Recovery</rt></ruby> 模式，并继续启动到正常模式。
|
||||
|
||||
![Exit The Recovery Mode In Ubuntu][13]
|
||||
|
||||
如果你不想启动到正常模式，输入 **reboot** 并从维护模式中按下 <ruby>回车<rt>ENTER</rt></ruby> 按键来重新启动你的系统。
|
||||
|
||||
### 在 Ubuntu 22.04 / 20.04 LTS 中启动到 <ruby>紧急<rt>Emergency</rt></ruby> 模式
|
||||
|
||||
当 GRUB 菜单出现时，按下 **"e"** 按键来编辑它。
|
||||
|
||||
![GRUB Menu In Ubuntu 22.04 / 20.04 LTS][14]
|
||||
|
||||
找到以单词 **"linux"** 开头的一行代码，并在其结尾处添加下面的一行代码。
|
||||
|
||||
```
|
||||
systemd.unit=emergency.target
|
||||
```
|
||||
|
||||
![Edit Grub Boot Menu Entries To Enter Into Emergency Mode In Ubuntu 22.04 / 20.04 LTS][15]
|
||||
|
||||
在添加上面的代码行后，按下 **Ctrl+x** 组合键，或按下 **F10** 按键来启动到 <ruby>紧急<rt>Emergency</rt></ruby> 模式。
|
||||
|
||||
数秒后，你将作为 `root` 用户来登陆到 <ruby>紧急<rt>Emergency</rt></ruby> 模式。将会提示你按下 <ruby>回车<rt>ENTER</rt></ruby> 按键来进入维护模式。
|
||||
|
||||
下图是 Ubuntu 22.04 / 20.04 LTS 系统的 <ruby>紧急<rt>Emergency</rt></ruby> 模式 的样子：
|
||||
|
||||
![Boot Into Emergency Mode In Ubuntu 22.04 / 20.04 LTS][16]
|
||||
|
||||
现在，在 <ruby>紧急<rt>Emergency</rt></ruby> 模式 中做你想做的任何事。在 <ruby>紧急<rt>Emergency</rt></ruby> 模式 中，在你执行任何操作前，你可能需要以 读/写 模式 的方式来挂载 root (**/**) 文件系统。
|
||||
|
||||
```
|
||||
mount -n -o remount,rw /
|
||||
```
|
||||
|
||||
在完成后，按下 **"Ctrl+d"** 组合键来启动到正常模式。或者，你可以输入下面的任意一个命令来启动到正常模式。
|
||||
|
||||
```
|
||||
systemctl default
|
||||
```
|
||||
|
||||
或者，
|
||||
|
||||
```
|
||||
exit
|
||||
```
|
||||
|
||||
如果你想重新启动系统，而不是启动到正常的模式，输入：
|
||||
|
||||
```
|
||||
systemctl reboot
|
||||
```
|
||||
|
||||
### 在 Ubuntu 18.04 LTS 中启动到 <ruby>救援<rt>rescue</rt></ruby> 模式
|
||||
|
||||
启动你的 Ubuntu 系统。当 GRUB 菜单出现时，选择第一项并按下按键 **"e"** 来编辑。(为到达其结尾处，只需要按下 **CTRL+e** 组合键，或使用你键盘上的 **END** 按键或 **左箭头/右箭头** 按键)：
|
||||
|
||||
![Grub Menu][17]
|
||||
|
||||
如果你没有看到 GRUB 菜单，只需要在 BIOS 徽标出现后，按下 ESC 按键来显示 GRUB 菜单。
|
||||
|
||||
找到以单词 **"linux"** 开头的一行代码，并在其结尾处添加下面的一行代码 (为到达其结尾处，只需要按下 **CTRL+e** 组合键，或使用你键盘上的 **END** 按键或 **左箭头/右箭头** 按键)：
|
||||
|
||||
```
|
||||
systemd.unit=rescue.target
|
||||
```
|
||||
|
||||
![Edit Grub Menu][18]
|
||||
|
||||
在添加上面的代码行后，只需要按下 **Ctrl+x** 组合键，或按下 **F10** 按键来启动到 <ruby>救援<rt>rescue</rt></ruby> 模式。数秒后，你将作为 `root` 用户来登陆到 <ruby>救援<rt>rescue</rt></ruby> 模式 (<ruby>单用户<rt>single user</rt></ruby> 模式) 。
|
||||
|
||||
下图是 Ubuntu 18.04 LTS 服务器 系统的 <ruby>救援<rt>rescue</rt></ruby> 模式 的样子：
|
||||
|
||||
![Ubuntu Rescue Mode][19]
|
||||
|
||||
接下来，输入下面的命令来挂载 root (**/**) 文件系统为 读/写 模式。
|
||||
|
||||
```
|
||||
mount -n -o remount,rw /
|
||||
```
|
||||
|
||||
### 启动到 <ruby>紧急<rt>Emergency</rt></ruby> 模式
|
||||
|
||||
启动你的 Ubuntu 到 <ruby>紧急<rt>Emergency</rt></ruby> 模式 基本与上述方法相同。你所需要做的全部工作是，在编辑 GRUB 菜单时，将 **"systemd.unit=rescue.target"** 替换为 **"systemd.unit=emergency.target"** 。
|
||||
|
||||
![Edit Grub Menu][20]
|
||||
|
||||
在你添加 "systemd.unit=emergency.target" 后，按下 **Ctrl+x** 组合键，或按下 **F10** 按键来启动到 <ruby>紧急<rt>Emergency</rt></ruby> 模式。
|
||||
|
||||
![Ubuntu Emergency Mode][21]
|
||||
|
||||
最后，你可以使用下面的命令来以 读/写 模式的方式 来挂载 root (**/**) 文件系统：
|
||||
|
||||
```
|
||||
mount -n -o remount,rw /
|
||||
```
|
||||
|
||||
### 在 <ruby>救援<rt>rescue</rt></ruby> 模式 和 <ruby>紧急<rt>Emergency</rt></ruby> 模式 之间切换
|
||||
|
||||
如果你正在 <ruby>救援<rt>rescue</rt></ruby> 模式 中，你不必像我上述提到的那样来编辑 GRUB 的菜单启动项。相反，你只想要输入下面的命令来立刻切换到 <ruby>紧急<rt>Emergency</rt></ruby> 模式：
|
||||
|
||||
```
|
||||
systemctl emergency
|
||||
```
|
||||
|
||||
同样，为从 <ruby>紧急<rt>Emergency</rt></ruby> 模式 切换到 <ruby>救援<rt>rescue</rt></ruby> 模式，输入：
|
||||
|
||||
```
|
||||
systemctl rescue
|
||||
```
|
||||
|
||||
### 总结
|
||||
|
||||
现在，你知道了什么是 <ruby>救援<rt>Rescue</rt></ruby> 模式 和 <ruby>紧急<rt>Emergency</rt></ruby> 模式，以及如何在 Ubuntu 22.04 、20.04 和 18.04 LTS 系统中启动到这些模式。 正如我已经提到的，在这里提供的这些步骤应该也适用于大多数当前使用 **Systemd** 作为默认服务管理器的 Linux 发行版。
|
||||
|
||||
--------------------------------------------------------------------------------
|
||||
|
||||
via: https://ostechnix.com/how-to-boot-into-rescue-mode-or-emergency-mode-in-ubuntu-18-04/
|
||||
|
||||
作者：[sk][a]
|
||||
选题：[lkxed][b]
|
||||
译者：[robsean](https://github.com/robsean)
|
||||
校对：[校对者ID](https://github.com/校对者ID)
|
||||
|
||||
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
|
||||
|
||||
[a]: https://ostechnix.com/author/sk/
|
||||
[b]: https://github.com/lkxed
|
||||
[1]: https://ostechnix.com/check-runlevel-linux/
|
||||
[2]: https://ostechnix.com/how-to-reset-or-recover-root-user-password-in-linux/
|
||||
[3]: https://ostechnix.com/wp-content/uploads/2022/05/GRUB-Menu-In-Ubuntu-22.04-LTS.png
|
||||
[4]: https://ostechnix.com/wp-content/uploads/2022/05/Edit-Grub-Boot-Menu-Entries-To-Enter-Into-Rescue-Mode-In-Ubuntu-22.04-LTS.png
|
||||
[5]: https://ostechnix.com/wp-content/uploads/2022/05/Boot-Into-Rescue-Mode-In-Ubuntu-22.04.png
|
||||
[6]: https://ostechnix.com/wp-content/uploads/2022/05/Mount-Root-File-System-In-Read-Write-Mode-In-Ubuntu.png
|
||||
[7]: https://ostechnix.com/wp-content/uploads/2022/05/Choose-Advanced-Options-For-Ubuntu-From-Grub-Boot-Menu.png
|
||||
[8]: https://ostechnix.com/wp-content/uploads/2022/05/Choose-Recovery-Mode-In-Grub-Boot-Menu-In-Ubuntu.png
|
||||
[9]: https://ostechnix.com/wp-content/uploads/2022/05/Enter-Into-Root-Shell-Prompt-In-Ubuntu.png
|
||||
[10]: https://ostechnix.com/wp-content/uploads/2022/05/Ubuntu-Maintenance-Mode.png
|
||||
[11]: https://ostechnix.com/wp-content/uploads/2022/05/Mount-Root-File-System-In-Read-Write-Mode-In-Ubuntu-1.png
|
||||
[12]: https://ostechnix.com/wp-content/uploads/2022/05/Boot-Into-Normal-Mode-In-Ubuntu.png
|
||||
[13]: https://ostechnix.com/wp-content/uploads/2022/05/Exit-The-Recovery-Mode-In-Ubuntu.png
|
||||
[14]: https://ostechnix.com/wp-content/uploads/2022/05/GRUB-Menu-In-Ubuntu-22.04-LTS.png
|
||||
[15]: https://ostechnix.com/wp-content/uploads/2022/05/Edit-Grub-Boot-Menu-Entries-To-Enter-Into-Emergency-Mode-In-Ubuntu.png
|
||||
[16]: https://ostechnix.com/wp-content/uploads/2018/12/Boot-Into-Emergency-Mode-In-Ubuntu-20.04-LTS.png
|
||||
[17]: https://ostechnix.com/wp-content/uploads/2018/12/Grub-menu.png
|
||||
[18]: https://ostechnix.com/wp-content/uploads/2018/12/Edit-grub-menu.png
|
||||
[19]: https://ostechnix.com/wp-content/uploads/2018/12/Ubuntu-rescue-mode.png
|
||||
[20]: https://ostechnix.com/wp-content/uploads/2018/12/emergency-mode.png
|
||||
[21]: https://ostechnix.com/wp-content/uploads/2018/12/emergency-mode-1.png
|
||||
Loading…
Reference in New Issue
Block a user