I made for a repeated time (after system update and/or system reboot) the experience,that my mailman3 installation fails to start because of permission error to write the log file.
For some unknown reason, an empty file /var/og/mailman/mailman.log was apparently owned by list:list. I deleted that file and mailman3 core could now be started. The start problem i solved.
I asked myself and you, how can this happen for many times? Has anyone an idea what the reason could be?
There is still a user list from a previous mailman3 installation, where I assigned the (former user for mailman2), but I suppose the problem is a different problem than a simple user definition.
The other log files are always correctly assigned to mailman:mailman
<pre> -rw-rw---- 1 mailman mailman 7487 Dec 22 18:21 bounce.log 0 -rw-rw---- 1 mailman mailman 0 Oct 8 22:46 debug.log 4 -rw-rw---- 1 mailman mailman 1909 Dec 24 09:10 mailman.log 57448 -rw-rw---- 1 mailman mailman 58820418 Dec 24 09:00 mailman.log.1 108 -rw-rw---- 1 mailman mailman 108407 Oct 24 12:18 mailman.log.2.gz 0 -rw-rw---- 1 mailman mailman 0 Oct 8 22:46 plugins.log 232 -rw-rw---- 1 mailman mailman 229585 Dec 24 09:10 smtp.log 4 drwxr-xr-x 2 mailman mailman 4096 Oct 20 00:00 <font color="#729FCF"><b>web</b></font> </pre>