We received the feedback that no UMC login is possible anymore after Upgrading to UCS 4.1. http://forum.univention.de/viewtopic.php?f=48&t=4557&p=17322#p17322 This is caused by not restarting the UMC-Webserver after the upgrade via UMC. There is a pop up to restart the server components which might be ignored. Maybe we should just do a hardcoded 'univention-management-console-web-server restart' in postup.sh?! Side effect could be that the login dialog pops up after the update if one wants to use other modules.
Ok, the problem was a different one: The template /etc/univention/templates/files/etc/apache2/sites-available/univention-management-console was manually overwritten. Maybe we should block the update if: univention-check-templates | grep /etc/univention/templates/files/etc/apache2/sites-available/univention-management-console
*** This bug has been marked as a duplicate of bug 43520 ***