To remove all omnibus-gitlab data use `sudo gitlab-ctl cleanse`.
To remove all users and groups created by omnibus-gitlab, before removing the gitlab package (with dpkg or yum) run `sudo gitlab-ctl remove_users`. *Note* All gitlab processes need to be stopped before runnign the command.
To remove all users and groups created by omnibus-gitlab, before removing the gitlab package (with dpkg or yum) run `sudo gitlab-ctl remove-accounts`. *Note* All gitlab processes need to be stopped before running the command.