Safest way to clean up boot partition - Ubuntu 14.04LTS-x64, Ubuntu 16.04LTS-x64 Reference See also: https://askubuntu.com/questions/18804/what-do-the-various-dpkg-flags-like-ii-rc-mean https://askubuntu.com/questions/365965/how-to-remove-all-rc-residual-packages-using-command-line-at-once Case I: if /boot is not 100% full and apt is working