Thank you for taking the time to file a bug report.
Checking the mailman package in Ubuntu Focal I see the logrotate file installed by this package contains some postrotate scripts that might be setting back the ownership to list:list. Take a look at /etc/logrotate.d/mailman and try to make the appropriate changes.
Since it seems likely to me that this is a local configuration problem,
rather than a bug in Ubuntu, I am marking this bug as 'Incomplete'.
However, if you believe that this is really a bug in Ubuntu, then we would
be grateful if you would provide a more complete description of the problem
with steps to reproduce, explain why you believe this is a bug in Ubuntu
rather than a problem specific to your system, and then change the bug
status back to "New".
Thank you for taking the time to file a bug report.
Checking the mailman package in Ubuntu Focal I see the logrotate file installed by this package contains some postrotate scripts that might be setting back the ownership to list:list. Take a look at /etc/logrotate. d/mailman and try to make the appropriate changes.
Since it seems likely to me that this is a local configuration problem,
rather than a bug in Ubuntu, I am marking this bug as 'Incomplete'.
However, if you believe that this is really a bug in Ubuntu, then we would
be grateful if you would provide a more complete description of the problem
with steps to reproduce, explain why you believe this is a bug in Ubuntu
rather than a problem specific to your system, and then change the bug
status back to "New".
For local configuration issues, you can find assistance here: www.ubuntu. com/support/ community
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