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[Launchpad Bug Tracker <1646222@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package ubuntu-release-upgrader - 1:17.04.6

---------------
ubuntu-release-upgrader (1:17.04.6) zesty; 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>  Wed, 21 Dec 2016
15:41:25 -0600

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: In Progress => 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:
  Won't Fix
Status in ubuntu-release-upgrader source package in Xenial:
  In Progress
Status in update-manager source package in Xenial:
  Won't Fix
Status in ubuntu-release-upgrader source package in Yakkety:
  New
Status in update-manager source package in Yakkety:
  Won't Fix

Bug description:
  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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