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purge-old-kernels not needed any more
https://github.com/dustinkirkland/byobu/blob/0a44bf215883cedac2f555ad7c6cc6feb43b4063/usr/bin/purge-old-kernels#L21-L27
https://github.com/kornicameister/dotfiles/blob/a74510679708f9ee53b66ff447020585c82db3cf/bin/upgrade#L126