Ubuntu Kernel Cleanup

Remove old Linux kernel versions on Ubuntu. This only keeps the currently used kernel and removes all the others. You have been warned. 🤞😁

df /boot/

dpkg --get-selections | cut -f1 | egrep '^linux-image-.+' | grep -v $(uname -r) | egrep -v 'linux-image-(generic|amd64)' > /tmp/old_kernels
less /tmp/old_kernels  # review
sudo apt-get purge $(cat /tmp/old_kernels)

df /boot/

For auto-installed kernels that are not kept back:

apt-get autoremove --purge

See also https://help.ubuntu.com/community/RemoveOldKernels

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