We started an Ubuntuserver for versioncontrol and would like to access our repositories via ssh.

As we need to give access to several external developers I thought it would be the best way to create a group per project and add the users to it which should use the repository. I cannot say how many projects will be created in the future, so I wonder if we could run into problems later.

Is there a maximum number of existing groups or groups of which a user can be member of in Ubuntu 12.04?