Comment 17 for bug 1515513

Note that the patch in #15 removes the leftovers related to the kernel version being removed currently. Removing leftovers related to already purged kernels still have to be done manually, for example by linux-purge https://www.bountysource.com/issues/38300038-feature-request-the-command-should-work-like-this together with other extra kernel related stuff.