The group administration is no longer included in the Community Edition from version 14.1 onwards.
For “old users”, i. e. those who have sent the statistics for a longer period of time up to and including version 1.8, the user administration will continue to be provided.
Group administration for long time CE users
Group administration for 1.8 CE in 14.1
or for a 19.1 docker installation:
The repo is entered on the host with the access data and the package egroupware-epl-groups must be installed. This is then passed on to the docker container.