[How To] Remove Old and Unused Kernels

From time to time Ubuntu updates the GRUB menu lists a lot of previous Linux kernels and eats a lot of hard-disk space. In this article, we will discuss how we can remove old and unused kernels from our system.

Check the kernel currently in use.

uname -r

List all the kernels installed.

dpkg --list | grep linux-image
dpkg --list | grep linux-headers
dpkg --list | grep linux-modules

Remove the kernel and it’s parts.

For example, I will remove kernel 4.15.0-135 and it’s all components.

WARNING! Don’t forget to change the version number as requires for your needs.

apt-get purge linux-headers-4.15.0-135-generic
apt-get purge linux-image-4.15.0-135-generic
apt-get purge linux-image-extra-4.15.0-135-generic
apt-get purge linux-modules-4.15.0-135-generic
apt-get purge linux-modules-extra-4.15.0-135-generic

Update the GRUB configuration.

sudo update-grub2

Reboot

reboot

Test Environment

Ubuntu 20.04 LTS (Focal Fossa)

VMware Workstation 15.1.0

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