Linux: CUSP server & login Username / Password
Source: https://help.ubuntu.com/lts/serverguide/cups.html
sudo usermod -aG lpadmin username
sudo systemctl restart cups.service
CUPS - Print Server
The primary mechanism for Ubuntu printing and print services is the Common UNIX Printing System (CUPS). This printing system is a freely available, portable printing layer which has become the new standard for printing in most Linux distributions.