alvin@xanthippe:~$ sudo lsof -i :631 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME cupsd 5115 root 3u IPv4 27358 TCP localhost:ipp (LISTEN)
Cups actually works. The message is just plain wrong. If cups is not started, the port is not in use.
alvin@xanthippe:~$ sudo lsof -i :631
COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME
cupsd 5115 root 3u IPv4 27358 TCP localhost:ipp (LISTEN)
Cups actually works. The message is just plain wrong. If cups is not started, the port is not in use.