Printing to a McGill uPrint printer with the ACELab printer card can be done both from the command line and from the GUI.

First check to see if the printers are available on your machine:

me@ace-ws-00:~$ lpstat -p

Output example will be vary on Ubuntu 16 and Ubuntu 18

printer HP-color-laserjet is idle.  enabled since Thu 26 Jan 2017 02:32:24 PM EST
printer McGill_Color is idle.  enabled since Thu 16 Feb 2017 02:43:59 PM EST
printer mcgill_mono is idle.  enabled since Thu 16 Feb 2017 02:44:14 PM EST
printer mcgill_mono_beta is idle.  enabled since Thu 16 Feb 2017 02:44:00 PM EST

You can see here a local printer and the McGill uPrint printers.

* 2 UPrint cards in NW (amni16 in NW145 and amni22 in NW136)

* 1 uPrint card in 527 (amni17)

To print a file named myfile.txt to mcgill_mono using the amni16 “Evans Lab Students” account:

me@ace-ws-00:~$ lp -U amni16 -d mcgill_mono myfile.txt
request id is mcgill_mono-117 (1 file(s))

Then, find the amni16 uPrint card and release the job at the printer.

* Create a directory and file under your home directory

mkdir -p ~/.cups/client.conf
touch ~/.cups/client.conf

* Add Lab uPrint card name (amni16 e.g.) into client.conf file

echo 'USER amni16'>> ~/.cups/client.conf

* Set a default printer in ~/.cups/lpoptions

lpoptions -d mcgill_mono

note: you can add all available printers into ~/.cups/lpoptions by editing the file

XXX@ace-ws-XX:~$ cat .cups/lpoptions 
McGill_Color
mcgill_mono
mcgill_mono_beta