Comment 39 for bug 1871538

FYI triggered again for me due to unattended upgrades.
The time in the journal when things go down matches the unpack/configuee/install phase of
- accountsservice:amd64 0.6.55-0ubuntu12~20.04.5
- libaccountsservice0:amd64 0.6.55-0ubuntu12~20.04.5
- dbus:amd64 1.12.16-2ubuntu2.1

I - again - had the usual suspect entries:

systemd[1]: Starting Daily apt upgrade and clean activities...
dbus-daemon[2266]: [system] Reloaded configuration
dbus-daemon[2266]: Unknown group "power" in message bus configuration file
systemd[1]: Reloading.
systemd[1]: NetworkManager.service: Unexpected error response from GetNameOwner(): Connection terminated

I didn't see anything in the log we didn't have before, but for completeness I'm attaching journal of the issue and a few hours before it