How to Remove Older Linux Kernel Versions in Ubuntu

The procedure to delete all unused old kernels on Ubuntu Linux version 18.04 and 20.04 LTS is as follows:

1. First, boot into a new kernel.
2. List all other older kernel using the dpkg command.
3. Note down system disk space usage by running the df -H command.
4. Delete all unused old kernels, run: sudo apt --purge autoremove.

1. How do I remove old kernel from grub?
2. How do I remove old Linux Mint kernels?
3. Can I downgrade Linux kernel?
4. How do I remove a kernel?
5. How do I uninstall Xanmod kernel?
6. How do I clean up grub menu?
7. How do I clean up Linux?
8. How do I clean storage in Linux?
9. How do I clean up Linux Mint?

How do I remove old kernel from grub?

7 Answers

1. Open up a terminal ( Ctrl + Alt + T ).
2. Type uname -r . ...
3. Run the following command: dpkg --list | grep linux-image . ...
4. Note down the names of all the kernels which you want to remove.
5. To remove the kernels, run: sudo apt-get purge linux-image-x.x.x.x-xyz (replace the kernel name with an appropriate one).

How do I remove old Linux Mint kernels?

Automatically Remove Old Kernels in Linux Mint,

1. Click on the Menu button in the panel to open the apps menu. ...
2. Go to System > Update Manager.
3. In Update Manager, click on main menu > Edit > Preferences.
4. Switch to the Automation tab.
5. Turn on the toggle option Remove obsolete kernels and dependencies.
6. Provide your password to confirm the operation.

Can I downgrade Linux kernel?

You can easily downgrade the Kernel. You just have to: Boot into an older kernel. Remove the newer Linux kernel you don't want.

How do I remove a kernel?

Remove Older Kernel Entries

1. Select "Package Cleaner" on the left and "Clean Kernel" from the right panel.
2. Press the "Unlock" button at the lower right, enter your password.
3. Select from the displayed list the kernel images and headers you wish to remove.

How do I uninstall Xanmod kernel?

You have Ubuntu kernels installed. Boot to an Ubuntu kernel using grub menu and remove all xanmod kernel images with synaptic. You need to remove them all, not the last one.

How do I clean up grub menu?

Clean up your grub menu from the kernels you do not use

1. Determine which Kernel you are using. Just run: uname -r. and write down the result, in my case this was my output: $ uname -r 2.6.22-14-generic.
2. Look for all installed kernel images. Go to /boot/ and list its contents. cd /boot ls vmlinuz* ...
3. Remove the kernels you want.

How do I clean up Linux?

Another way to clean up Linux is using a powertool called Deborphan.
...
Terminal commands

1. sudo apt-get autoclean. This terminal command deletes all . ...
2. sudo apt-get clean. This terminal command is used to free up the disk space by cleaning up downloaded . ...
3. sudo apt-get autoremove.

How do I clean storage in Linux?

How to free up disk space in Ubuntu and Linux Mint

1. Get rid of packages that are no longer required [Recommended] ...
2. Uninstall unnecessary applications [Recommended] ...
3. Clean up APT cache in Ubuntu. ...
4. Clear systemd journal logs [Intermediate knowledge] ...
5. Remove older versions of Snap applications [Intermediate knowledge]

How do I clean up Linux Mint?

How to Clean Linux Mint Safely

1. Empty the trash bin.
2. Clear the updates cache.
3. Clear the thumbnail cache.
4. The registry.
5. Make Firefox cleanse itself automatically upon quitting.
6. Consider removing Flatpaks and the Flatpak infrastructure.
7. Tame your Timeshift.
8. Remove most Asian fonts.