Low disk space on “boot”

Ubuntu downloads upgrades as new kernel and leaves the old kernels in /boot so you have the option to revert to old kernels. This had my /boot on “low disk space” so I had to delete old kernels.

Screenshot from 2017-06-23 12-06-36

I followed the instructions in this thread for a fix.

  1. Check current version of your kernel with uname -a.
  2. List down old packages with
    dpkg -l 'linux-*' | sed '/^ii/!d;/'"$(uname -r | sed "s/\(.*\)-\([^0-9]\+\)/\1/")"'/d;s/^[^ ]* [^ ]* \([^ ]*\).*/\1/;/[0-9]/!d'
  3. Delete each package with sudo apt-get -y purge some-kernel-package.
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