** Description changed:
- I have a /boot partition which is sized just right to accommodate 3
- kernels, plus a little bit of overhead.
+ [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'
+ 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)
** Changed in: ubuntu-release-upgrader (Ubuntu Yakkety)
Importance: Undecided => High
** Changed in: ubuntu-release-upgrader (Ubuntu Yakkety)
Status: New => In Progress
** Changed in: ubuntu-release-upgrader (Ubuntu Yakkety)
Assignee: (unassigned) => Steve Langasek (vorlon)
** Changed in: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided => High
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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
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