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130 lines
5.3 KiB
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[#]: subject: "How to Boot into an Older Kernel By Default in Ubuntu and Other Linux"
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[#]: via: "https://itsfoss.com/boot-older-kernel-default/"
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[#]: author: "Abhishek Prakash https://itsfoss.com/author/abhishek/"
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[#]: collector: "lkxed"
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[#]: translator: " "
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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How to Boot into an Older Kernel By Default in Ubuntu and Other Linux
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======
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Here’s a possible scenario. Your system received a kernel update but somehow things are not working as smoothly as previously.
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You realized that if you boot into the older kernel (yes, you can downgrade kernel), things are back to normal.
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That makes you happy with a little inconvenience. You have to manually select the older kernel at each boot.
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This problem was faced by an elderly It’s FOSS reader. The new kernel update in [Linux Mint][1] wasn’t working as expected. Booting into the older kernel ‘fixed’ the issues but choosing the older kernel at each boot was a problem.
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Removing the new kernel (while using the older kernel) is not a good idea because the new kernel will be installed and used with the next system updates.
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So, I suggested booting into the older Linux kernel by default. How to do that? That’s what I am going to show you in this tutorial.
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### Booting into the older Linux kernel
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If you are not already familiar with it, your Linux distribution keeps more than one Linux kernel installed on your system. Don’t believe me? [List the installed kernels in Ubuntu][2] with this command:
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```
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apt list --installed | grep linux-image
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```
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When you get a new kernel version with the system updates, your system automatically chooses to boot into the latest available kernel.
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From the [grub][3] screen, you can **go to the Advanced options** (or older Linux versions):
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![ubuntu grub][4]
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Here, you can see the available kernels to boot into. Choose the older one (without recovery option):
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![grub advanced options][5]
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You won’t notice any visual difference. Your files and applications remain the same.
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Now that you have booted into the older kernel, it’s time to make your system boot into it automatically.
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### Making older kernel the default
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If you are comfortable with Linux terminal and commands, you can modify the /etc/default/grub file and add the following lines to it:
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```
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GRUB_DEFAULT=saved
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GRUB_SAVEDEFAULT=true
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```
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And then [update grub][6] with:
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```
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sudo update-grub
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```
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What you did here is to tell your system to save the currently used entry as the default entry for the future runs of GRUB.
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However, not everyone is okay with the command line and hence I’ll focus on a GUI tool called [Grub Customizer][7].
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#### Installing Grub Customizer
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Use the official PPA to [install Grub Customizer in Ubuntu-based distributions][8]:
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```
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sudo add-apt-repository ppa:danielrichter2007/grub-customizer
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sudo apt update
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sudo apt install grub-customizer
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```
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For other distributions, please use your package manager to install this tool.
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#### Using Grub Customizer to change the default boot entry
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When you run Grub Customizer, it shows the available boot entries.
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![grub customizer ubuntu][9]
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You have two options here.
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**Option1:** Select the desired kernel entry and use the arrow (displayed on the top menu) to move it up the order.
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![move older kernel up the order ubntu grub][10]
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**Option2:** Make the ‘previously booted entry’ the ‘default entry’.
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![make currently booted entry as default ubuntu][11]
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I would suggest going with option 2 because it will work even when there are new kernel updates.
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This way you downgrade the kernel in Ubuntu or other distributions without even removing the older kernel version.
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Do note that most distributions like Ubuntu only keep two kernel versions at a time. So eventually, your preferred older kernel will be removed with the newer kernel versions.
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This neat trick helped me when I [installed the latest Linux kernel in Ubuntu][12] and it had issues with my audio system for some reason.
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Whatever may be the reason, you now know how to boot into an older kernel automatically.
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Questions? Suggestions? The comment section is all yours.
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--------------------------------------------------------------------------------
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via: https://itsfoss.com/boot-older-kernel-default/
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作者：[Abhishek Prakash][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/abhishek/
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[b]: https://github.com/lkxed
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[1]: https://linuxmint.com/
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[2]: https://learnubuntu.com/list-installed-kernels/
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[3]: https://itsfoss.com/what-is-grub/
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[4]: https://itsfoss.com/wp-content/uploads/2022/06/ubuntu-grub.jpg
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[5]: https://itsfoss.com/wp-content/uploads/2022/06/Grub-Advanced-Options.jpg
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[6]: https://itsfoss.com/update-grub/
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[7]: https://itsfoss.com/customize-grub-linux/
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[8]: https://itsfoss.com/install-grub-customizer-ubuntu/
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[9]: https://itsfoss.com/wp-content/uploads/2022/06/grub-customizer-ubuntu.png
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[10]: https://itsfoss.com/wp-content/uploads/2022/06/move-older-kernel-up-the-order-ubntu-grub.png
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[11]: https://itsfoss.com/wp-content/uploads/2022/06/make-currently-booted-entry-as-default-ubuntu.png
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[12]: https://itsfoss.com/upgrade-linux-kernel-ubuntu/
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