[Bug 1357093] Re: Kernels not autoremoving, causing out of space error on LVM or Encrypted installation or on any installation, when /boot partition gets full

[Brian Candler]

I have two Precise (12.04) servers with

Unattended-Upgrade::Remove-Unused-Dependencies "true";

in 50unattended-upgrades.  One of them cleans up its kernels and only
keeps the last two; one of them accumulates kernels over time, and I
occasionally get alerts about /boot filling up.

On the latter machine, "apt-get autoremove --purge" doesn't remove them.
I end up removing the packages individually; the script "purge-old-
kernels" referred to above doesn't seem to exist.

The main difference I can see is that the latter machine has linux-
image-generic-lts-trusty, whereas the first machine has linux-image-
server.

Both machines have in /etc/apt/apt.conf.d/05aptitude:

aptitude::Keep-Unused-Pattern "^linux-image.*$ | ^linux-restricted-
modules.*$ | ^linux-ubuntu-modules.*$";

So I don't think that's it. I suppose there won't be too many kernel
updates for Precise before it goes end of life now though...

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https://bugs.launchpad.net/bugs/1357093

Title:
  Kernels not autoremoving, causing out of space error on LVM or
  Encrypted installation or on any installation, when /boot partition
  gets full

Status in unattended-upgrades package in Ubuntu:
  Fix Released

Bug description:
  Currently if one chooses to use LVM or encrypted install, a /boot
  partition is created of 236Mb

  Once kernel updates start being released this partition soon fills
  until people are left unable to upgrade.

  While you and I might know that we need to watch partition space, many
  of the people we have installing think that a windows disk is a disk
  and not a partition, education is probably the key - but in the
  meantime support venues keep needing to deal with the fact the
  partition is too small and/or old kernels are not purged as new ones
  install.

  For workaround and sytem repair, see
  https://help.ubuntu.com/community/Lubuntu/Documentation/RemoveOldKernels

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