To install members just follow these instructions.
/ubuntu/trusty/universe///install/index.html Shows the members of a group; by default, all members Ubuntu 14.04 LTS universe/admin 20080128-5
sudo apt-get install members
Which will install members and any other packages on which it depends.
|Maintainer||Ubuntu MOTU Developers
|Description||Shows the members of a group; by default, all members|