[PROBLEM] Local UI does not start after software update

[NHWally]

After an in-place update?
can you ssh into it? what user do you specify? what password?

P.S.
you can write them here, we cannot get into your machine...

I can ssh to the machine with the username/password that I setup (long ago) with pi-imager.

The syslog shows chrome not starting:

Feb 29 14:53:14 Moode bluealsa[1235]: bluealsa: [1235] D: bluez.c:796: BlueZ battery provider support not available
Feb 29 14:53:15 Moode systemd[1]: Reloading.
Feb 29 14:53:15 Moode systemd[1317]: localui.service: Failed to determine user credentials: No such process
Feb 29 14:53:15 Moode systemd[1317]: localui.service: Failed at step USER spawning /usr/bin/xinit: No such process
Feb 29 14:53:15 Moode systemd[1]: Started Start Chromium Browser.
Feb 29 14:53:15 Moode systemd[1]: localui.service: Main process exited, code=exited, status=217/USER
Feb 29 14:53:15 Moode systemd[1]: localui.service: Failed with result 'exit-code'.
Feb 29 14:53:30 Moode systemd-timesyncd[308]: Initial synchronization to time server 45.79.35.159:123 (2.debian.pool.ntp.org).
Feb 29 14:53:34 Moode systemd[1]: systemd-rfkill.service: Succeeded.
Feb 29 14:53:34 Moode bthelper[1347]: Changing power off succeeded



The question is where did worker.php get the 'pi' username from with this code:

$_SESSION['user_id'] = getUserID();   // line 343 in worker.php