AFAIK it’s used by Debian based or other distros as the default/main user group. It is about how the local admin wants to handle a multi-user system for data sharing. Arch uses the group named as the user name. 
AFAIK it’s used by Debian based or other distros as the default/main user group. It is about how the local admin wants to handle a multi-user system for data sharing. Arch uses the group named as the user name.