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geekpi
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[#]: subject: "How to Access the GRUB Menu in Virtual Machine"
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[#]: via: "https://itsfoss.com/access-grub-virtual-machine/"
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[#]: author: "Sagar Sharma https://itsfoss.com/author/sagar/"
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[#]: collector: "lkxed"
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[#]: translator: "geekpi"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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How to Access the GRUB Menu in Virtual Machine
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======
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Most modern VMs are configured to skip the [GRUB bootloader][1] for a seamless experience.
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However, you might need to access the GRUB menu at times. For example, if you want to switch back to the older kernel or get into recovery mode for [resetting the password][2].
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> 💡 Reboot your VM and keep the Shift key pressed when it is booting up again. This should give you the GRUB menu.
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In this quick article, I will be showing you two ways to access the GRUB menu in Linux running in a virtual machine:
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- A temporary solution (when you have to access GRUB once or twice)
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- A permanent solution (will show GRUB at every boot)
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As most of the users are not going to interact with the grub on a daily basis, I will start with a temporary solution in which you can access the grub without any tweaks.
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> 📋 I have used Ubuntu in the tutorial here but the steps should be valid for other Linux distributions as well.
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### Access the GRUB bootloader in VM (Quick way)
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If you want to access the GRUB occasionally, this is supposed to be the best way as it does not require any configuration.
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Just reboot your system and keep the `shift` key pressed.
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That's it!
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You will have your grub menu without any time limit:
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![Accessing grub menu in VM using shift key][3]
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Pretty simple way. Isn't it?
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But it will work for that specific boot only. So what if you want to have the grub on every boot? Refer to the given method.
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### Enable Grub menu in virtual machines permanently (if you want to)
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> 🚧 This method requires changing Grub config file in the command line. Please ensure that you are comfortable doing the edits in the terminal.
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If you have to deal with the grub menu to access the other operating systems or change[boot from the older kernels][4] often, this method is just for you.
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To make the grub accessible at every boot, you must make changes in the configuration file.
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First, open the grub config file using the following command:
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```
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sudo nano /etc/default/grub
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```
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Here, change the `GRUB_TIMEOUT_STYLE=hidden` to the `GRUB_TIMEOUT_STYLE=menu`:
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![change grub timeout style][5]
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Next, in the same config file, specify for how many seconds you want the grub to be displayed.
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I would recommend 5 seconds as it seems to balance between not too long and short (yep, quite relatable):
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```
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GRUB_TIMEOUT=5
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```
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![configure grub timeout in ubuntu][6]
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And finally, you can [save the changes and exit from the nano][7] text editor.
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To activate the changes you made to the config file, update the grub using the following command:
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```
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sudo update-grub
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```
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That's it. Reboot your system and the grub should be there for 5 seconds.
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### How about theming GRUB?
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You will get the grub bootloader in most of the Linux distros as it is quite simple to configure and gets the job done.
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But by default, it's nothing apart from the black background and plain text. So we made a guide on how you can make it look dope:
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I hope you will find this guide helpful and if you have any queries, let me know in the comments.
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/access-grub-virtual-machine/
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作者：[Sagar Sharma][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://itsfoss.com/author/sagar/
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[b]: https://github.com/lkxed/
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[1]: https://itsfoss.com/what-is-grub/
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[2]: https://itsfoss.com/how-to-hack-ubuntu-password/
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[3]: https://itsfoss.com/content/images/2023/07/access-GRUB-in-Ubuntu-VM.gif
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[4]: https://itsfoss.com/boot-older-kernel-default/
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[5]: https://itsfoss.com/content/images/2023/07/change-grub-style.webp
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[6]: https://itsfoss.com/content/images/2023/07/configure-grub-timeout-in-ubuntu.webp
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[7]: https://linuxhandbook.com/nano-save-exit/
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@ -0,0 +1,109 @@
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[#]: subject: "How to Access the GRUB Menu in Virtual Machine"
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[#]: via: "https://itsfoss.com/access-grub-virtual-machine/"
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[#]: author: "Sagar Sharma https://itsfoss.com/author/sagar/"
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[#]: collector: "lkxed"
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[#]: translator: "geekpi"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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如何访问虚拟机中的 GRUB 菜单
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======
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大多数现代虚拟机都配置为跳过 [GRUB 引导加载程序][1]以获得无缝体验。
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但是，你有时可能需要访问 GRUB 菜单。例如，如果你想切换回旧内核或进入恢复模式以[重置密码][2]。
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> 💡 重启虚拟机并在再次启动时按住 Shift 键。这将为你提供 GRUB 菜单。
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在这篇简短的文章中，我将向你展示两种访问虚拟机中运行的 Linux 中的 GRUB 菜单的方法：
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- 临时方案（当你需要访问 GRUB 一次或两次时）
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- 永久方案（每次启动时都会显示 GRUB）
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由于大多数用户不会每天与 grub 交互，因此我将从一个临时解决方案开始，你可以在其中无需任何调整即可访问 grub。
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> 📋 我在此处的教程中使用了 Ubuntu，但这些步骤也适用于其他 Linux 发行版。
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### 在虚拟机中访问 GRUB 引导加载程序（快速方式）
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如果你偶尔想访问 GRUB，这应该是最好的方法，因为它不需要任何配置。
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只需重新启动系统并按住 `shift` 键即可。
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就是这样！
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你将拥有没有任何时间限制的 grub 菜单：
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![Accessing grub menu in VM using shift key][3]
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很简单的方法。不是吗？
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但它仅适用于特定的启动。那么如果你想在每次启动时都进入 grub 该怎么办呢？ 请参考下面的方法。
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### 永久在虚拟机中启用 Grub 菜单（如果你愿意）
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> 🚧 此方法需要在命令行中更改 Grub 配置文件。请确保你能够轻松地在终端中进行编辑。
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如果你需要处理 grub 菜单来访问其他操作系统或经常更改[从旧内核启动][4]，那么此方法非常适合你。
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要使 grub 在每次引导时都可访问，你必须在配置文件中进行更改。
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首先，使用以下命令打开 grub 配置文件：
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```
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sudo nano /etc/default/grub
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```
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在这里，将 `GRUB_TIMEOUT_STYLE=hidden` 更改为 `GRUB_TIMEOUT_STYLE=menu`：
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![change grub timeout style][5]
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接下来，在同一个配置文件中，指定你希望 grub 显示的秒数。
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我建议 5 秒，因为它似乎在太长和太短之间取得了平衡（是的，非常相关）：
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```
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GRUB_TIMEOUT=5
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```
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![configure grub timeout in ubuntu][6]
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最后，你可以[保存更改并退出 nano][7] 编辑器。
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要激活对配置文件所做的更改，请使用以下命令更新 grub：
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```
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sudo update-grub
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```
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就是这样。重启动统，grub 应该会存在 5 秒钟。
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### 将 GRUB 主题化如何？
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大多数 Linux 发行版都会使用 grub 引导加载程序，因为它的配置非常简单，而且能完成工作。
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但在默认情况下，除了黑色背景和纯文本外，它什么都不是。因此，我们制作了一份指南，教你如何让它看起来更漂亮：
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希望本指南对你有所帮助，如果你有任何疑问，请在评论中告诉我。
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/access-grub-virtual-machine/
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作者：[Sagar Sharma][a]
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选题：[lkxed][b]
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译者：[geekpi](https://github.com/geekpi)
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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://itsfoss.com/author/sagar/
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[b]: https://github.com/lkxed/
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[1]: https://itsfoss.com/what-is-grub/
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[2]: https://itsfoss.com/how-to-hack-ubuntu-password/
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[3]: https://itsfoss.com/content/images/2023/07/access-GRUB-in-Ubuntu-VM.gif
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[4]: https://itsfoss.com/boot-older-kernel-default/
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[5]: https://itsfoss.com/content/images/2023/07/change-grub-style.webp
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[6]: https://itsfoss.com/content/images/2023/07/configure-grub-timeout-in-ubuntu.webp
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[7]: https://linuxhandbook.com/nano-save-exit/
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