according to this page (https://www.univention.de/produkte/ucs/funktionen/zentrale-datenablage/) it should be possible to define quotas both for users and for groups. But although we activated quota support for the partition, we can only choose user accounts for quotas.
Even after replacing usrquota by grpquota in /etc/fstab and a reboot, the group accounts are not available for quotas.
We are using the current release of UCS with all updates installed.
Thanks for any hints or suggestions.