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[Launchpad Bug Tracker <1646222@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-release-upgrader - 1:16.04.21

---------------
ubuntu-release-upgrader (1:16.04.21) xenial; urgency=medium

  * DistUpgrade/DistUpgradeCache.py: import kernel initrd size estimation
    code from update-manager (since u-r-u is the only consumer of it) and
    refactor in order to give more accurate estimates.  LP: #1646222.

 -- Steve Langasek <steve.langasek@xxxxxxxxxx>  Thu, 22 Dec 2016
00:05:53 -0600

** Changed in: ubuntu-release-upgrader (Ubuntu Xenial)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1646222

Title:
  calculation of needed free space in /boot is inaccurate and causes
  refusal to upgrade

Status in ubuntu-release-upgrader package in Ubuntu:
  Fix Released
Status in update-manager package in Ubuntu:
  Triaged
Status in ubuntu-release-upgrader source package in Xenial:
  Fix Released
Status in update-manager source package in Xenial:
  Won't Fix
Status in ubuntu-release-upgrader source package in Yakkety:
  In Progress
Status in update-manager source package in Yakkety:
  Won't Fix

Bug description:
  [SRU Justification]
  In some configurations, update-manager will refuse to upgrade kernel packages, citing lack of space in /boot even though there is enough space in /boot and if the upgrade is done with 'apt dist-upgrade', it succeeds.  Affected users may as a result fail to have security updates applied to their system, unless they know how to run apt from the commandline or have unattended upgrades enabled.

  [Test case]
  1. Check the space currently used on /boot with du -sh.
  2. Create a partition 120MB larger than the space used on /boot.
  3. Copy the contents of your /boot directory into this partition.
  4. Mount this partition as /boot.
  5. Configure your system so that a newer kernel ABI is available (e.g., by enabling -proposed; or by waiting for the next kernel update to publish; or by downgrading the kernel using apt-get and rebooting).
  6. Run update-manager.
  7. Verify that update-manager refuses to upgrade, citing a lack of space in /boot.
  8. Install python3-distupgrade and ubuntu-release-upgrader-core from -proposed.
  9. Re-run update-manager.
  10. Verify that update-manager proceeds with the upgrade, and that the upgrade succeeds, with no failure due to lack of disk space on /boot.
  11. Repeat steps 2-9 with a partition that is only 60MB larger than the space used on /boot.
  12. Verify that update-manager still refuses to proceed with the upgrade, with the packages from -proposed.

  [Regression potential]
  Since this changes the limit at which update-manager refuses to upgrade due to lack of free space, if the new calculation of the minimum required free space is too low, users may see update-manager proceed with the upgrade, then fail at the dpkg stage, requiring manual recovery.

  [Original report]
  I have a /boot partition which is sized just right to accommodate 3 kernels, plus a little bit of overhead.

  $ df -h /boot/
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/sda5       280M  144M  118M  56% /boot
  $

  Previously, update-manager had no problem letting me upgrade kernels.
  With the latest kernel update in 16.10, I got an error message that I
  needed more free space on this filesystem.

  After bypassing update-manager with 'sudo apt dist-upgrade', the
  filesystem's usage looks like this:

  $ df -h /boot/
  Filesystem      Size  Used Avail Use% Mounted on
  /dev/sda5       280M  206M   56M  79% /boot
  $

  So update-manager is getting the disk usage requirement for /boot off
  by a factor of 2 (at least? I didn't save the error message from the
  dialog).

  It's better to refuse to upgrade than to fail mid-upgrade due to disk
  space, but not if that means getting stuck forever with an old kernel
  unnecessarily.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: update-manager 1:16.10.7
  ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1
  Uname: Linux 4.8.0-27-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Nov 30 12:10:25 2016
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'window-height' b'551'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'window-width' b'813'
   b'com.ubuntu.update-manager' b'launch-time' b'1480522730'
  InstallationDate: Installed on 2010-09-24 (2259 days ago)
  InstallationMedia: Ubuntu 10.04.1 LTS "Lucid Lynx" - Release amd64 (20100816.1)
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to yakkety on 2016-10-28 (32 days ago)

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