I've just experienced this problem again.
The following packages were just updated (from /var/log/apt/history.log):
Start-Date: 2018-07-31 09:48:46
Commandline: aptdaemon role='role-commit-packages' sender=':1.2928'
Upgrade: intel-microcode:amd64 (3.20180425.1~ubuntu0.18.04.1,
Public bug reported:
Just finished copying a file to a USB stick, which was then unmounted.
The Eject button was pressed before the copy finished; a window popped
up saying the volume was still busy. When the copy finished the busy
window disappeared, a notification saying not to remove the
Public bug reported:
This just popped up when I switched back to a session - immediately
after unlocking the screen.
ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: evolution-data-server 3.6.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7
Uname: Linux 3.5.0-19-generic
Same problem, fresh install of 11.10 beta 2; updated and it's still an
issue. Package version 3.2.0-0ubuntu1
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https://bugs.launchpad.net/bugs/832603
