Bug#965062: systemd: Cannot resolve user name systemd-network: No such process

[Marc Lehmann]

Package: systemd
Version: 241-7~deb10u4
Severity: normal

Dear Maintainer,

after upgrading multiple systems from jessie to buster, systemd-networkd
and systemd-resolved no longer start on any of them, both with similar
error messages:

Jul 15 11:42:17 pxe systemd-networkd[327]: Cannot resolve user name systemd-network: No such process
Jul 15 11:42:18 pxe systemd-resolved[472]: Cannot resolve user name systemd-resolve: No such process

Both daemons worked fine before the upgrade. googling shows me a number of
reports related to DynamicUsers, but this doesn't seem to apply to this
case, as both users exist in /etc/passwd:

   systemd-timesync:x:100:102:systemd Time Synchronization,,,:/run/systemd:/bin/false
   systemd-network:x:101:103:systemd Network Management,,,:/run/systemd/netif:/bin/false
   systemd-resolve:x:102:104:systemd Resolver,,,:/run/systemd/resolve:/bin/false
   systemd-coredump:x:999:999:systemd Core Dumper:/:/usr/sbin/nologin

I cannot run reportbug on the affected system, so I removed the
automatically-added info as it would refer to the wrong system.