This also happened to me when upgrading from 17.10 to 18.04 here's the
relevant bit of the upgrade log files:
main.log:
2018-01-05 15:22:34,603 DEBUG failed to SystemUnLock() (E:Not locked)
2018-01-05 15:38:49,081 ERROR got an error from dpkg for pkg: 'systemd':
'triggers looping, abandoned'
2018-01-05 15:38:49,081 DEBUG running apport_pkgfailure() systemd: triggers
looping, abandoned
2018-01-05 15:40:02,214 ERROR Exception during pm.DoInstall()
Traceback (most recent call last):
File "/tmp/ubuntu-release-upgrader-1fsoxbon/DistUpgrade/DistUpgradeView.py",
line 218, in run
res = pm.do_install(self.writefd)
apt_pkg.Error: E:Sub-process /usr/bin/dpkg exited unexpectedly
2018-01-05 15:40:02,265 ERROR SystemError from cache.commit():
installArchives() failed
2018-01-05 15:40:02,265 ERROR found exception: 'E:Sub-process /usr/bin/dpkg
exited unexpectedly'
apt-term.log:
Setting up gstreamer1.0-plugins-bad:amd64 (1.12.4-2ubuntu1) ...^M
dpkg: ../../src/packages.c:245: process_queue: Assertion `dependtry <= 4'
failed.^M
** Tags added: bionic rls-bb-incoming
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https://bugs.launchpad.net/bugs/1512322
Title:
dpkg assert failure: dpkg: ../../src/packages.c:245: process_queue:
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