Remove old kernels

(By default will keep the current kernel plus two more)

sudo apt-get -y install bikeshed
sudo purge-old-kernels

Or:

1. Fully update the system

   sudo apt-get update
   sudo apt-get dist-upgrade
   

2. Reboot

3. Show the list of what’s to be removed

   dpkg -l linux-image* linux-restricted* | grep ^i | egrep -v "linux-image-generic|linux-restricted-modules-common|`uname -r`" | awk '{print $2}' | paste -sd " "
   

4. Remove old kernels

   dpkg -l linux-image* linux-restricted* | grep ^i | egrep -v "linux-image-generic|linux-restricted-modules-common|`uname -r`" | awk '{print $2}' | paste -sd " " | xargs sudo apt-get remove