To elaborate more I seen the following in the console output of a job
which upgrades from bionic to cosmic:
Setting up ubuntu-release-upgrader-core (1:18.10.11.6) ...
Configuration file '/etc/update-manager/release-upgrades'
==> Modified (by you or by a script) since installation.
==> Package distributor has shipped an updated version.
What would you like to do about it ? Your options are:
Y or I : install the package maintainer's version
N or O : keep your currently-installed version
D : show the differences between the versions
Z : start a shell to examine the situation
The default action is to keep your current version.
*** release-upgrades (Y/I/N/O/D/Z) [default=N] ? dpkg: error: dpkg status
database is locked by another process
auto-upgrade [06:09:35]: ERROR: ERROR: Something went wrong with the upgrade.
release-upgrades has had Prompt changed from lts to normal so that we
can test the upgrade to cosmic and then we get the bytes like object
crash.
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https://bugs.launchpad.net/bugs/1796193
Title:
DistUpgradeViewNonInteractive crashes / requires interaction
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