[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

[Ian Weisser]

Jarno Suni,

That possible cause seems irrelevant to Unattended-Upgrades. Any
package installed by any front-end to apt will be upgraded. U-U doesn't
know what packages are installed, nor care. U-U simply tells aptdaemon
to upgrade packages from the repositories authorized by the user. U-U
does not duplicate nor replace Software Updater, and both can safely be
used.

Try running 'apt autoremove' (16.04) or 'apt-get autoremove'
(12.04/14.04).

If those kernels are not removed, then your problem is the apt-marking, 
not U-U. There are several ways to prevent automatically marking kernel
packages as 'auto' - the most common is by installing kernel header
packages.

If those kernels are removed, then check the U-U logs in /var/log to
ensure that U-U is really operating.

A bug report is an awful place to try to troubleshoot in this way. If
you open a thread on UbuntuForums, we may be able help you better.

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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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