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[Steve Langasek <steve.langasek@xxxxxxxxxxxxx>]

I was able to reproduce this problem in a VM.  Running X and compiz
under gdb, I find that compiz is dying after the X server is killed with
SIGKILL.

I also see this in /var/log/syslog:

Mar 25 22:31:40 trusty-upgrade kernel: [ 7167.438442] init: lightdm
post-stop process (2433) killed by KILL signal

There is no evidence in dmesg that this is OOM related.  So something
appears to be inappropriately kill -9'ing lightdm on upgrade.

This is not the only process in /var/log/syslog showing as killed with
SIGKILL.

The first of these happens in the logs at 22:31:39.  At that time,
/var/log/dpkg shows these packages being configured: udisks desktop-
file-utils gvfs-common gvfs-libs gvfs-daemons gvfs psmisc python-gi.

/var/log/dist-upgrade/apt-term.log doesn't show anything particularly
illuminating.

Attaching the contents of /var/log.

** Attachment added: "logs.tar.gz"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1555237/+attachment/4612158/+files/logs.tar.gz

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https://bugs.launchpad.net/bugs/1555237

Title:
  Upgrade from 14.04.4→ 16.04 dies midway taking out the session.

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