Ubuntu 20.04 remove old unused kernels

https://askubuntu.com/a/1253348

Check what current kernel You are running:

uname -a
Linux blackhole 5.6.13-050613-lowlatency #202005141310 SMP PREEMPT Thu May 14 13:17:41 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

So, this system runs 5.6.13-050613-lowlatency kernel.

List all installed kernels in Your OS:

dpkg --list | egrep -i --color 'linux-image|linux-headers|linux-modules' | awk '{ print $2 }'
linux-headers-5.6.11-050611
linux-headers-5.6.11-050611-lowlatency
linux-headers-5.6.13-050613
linux-headers-5.6.13-050613-lowlatency
linux-image-unsigned-5.6.11-050611-lowlatency
linux-image-unsigned-5.6.13-050613-lowlatency
linux-modules-5.6.11-050611-lowlatency
linux-modules-5.6.13-050613-lowlatency

Uninstall kernels You don’t need:

sudo apt purge linux-headers-5.6.11-050611  linux-headers-5.6.11-050611-lowlatency linux-image-unsigned-5.6.11-050611-lowlatency linux-modules-5.6.11-050611-lowlatency

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