rbCleanupUbuntuKernels

Remove any old unused kernel installs

Turns out there is already a tool for this in the universe repo:

sudo aptitude install bikeshed

Then put this in a file in /etc/cron.monthly/ (or .weekly or .daily, depending on how often you want it, but monthly for cleaning out the kernels should be plenty):

#!/bin/bash

#optional:
aptitude update
aptitude full-upgrade -y

purge-old-kernels -y
apt-get autoremove -y

If this computer does not run 24/7, install anacron to make sure the cron.monthly scripts get run.