This was fixed in Xenial. The default is now to remove newly unused dependencies after every unattended upgrade.
--- unattended-upgrades (0.89) unstable; urgency=medium [ Michael Vogt ] * Add `Unattended-Upgrade::Remove-New-Unused-Dependencies` that defaults to "yes". This ensures that older kernel get automatically cleaned up and /boot will not overflow. LP: #1267059 * Remove downloaded deb packages after successful installs. This can be controlled via the option: `Unattended-Upgrade::Keep-Debs-After-Install` (Closes: #809428) * Only remove debs in the cache dir [ Steffen Köhler ] * Allow to configure sender email via `Unattended-Upgrade::Sender` [ Antti Riikonen ] * Minor typo fix in comment [ Cleto Martin ] * bugfix: non-ascii chars in dpkg log file crashes unattended upgrades Closes: #812857 [ James Valleroy ] * Set debconf value for auto updates based on current configuration. [ Alexandre Detiste ] * update French transalation -- Michael Vogt <m...@debian.org> Sat, 30 Jan 2016 16:04:52 +0100 ** Tags removed: xenial ** Changed in: unattended-upgrades (Ubuntu) Importance: High => Wishlist -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unattended-upgrades in Ubuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unattended-upgrades/+bug/1357093/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp