I have installed Elementary OS loki on my T400 notebook.(old but works flawlessly lol )
I have a NAS server which has virtualbox installed. There is a virtual machine with windows installed and my printer is shared via this virtual machine. This is done because my printer is so ancient it doesn't work with the print plugin on the NAS box.
I can see my printer via a laptop running windows 7 and it prints fine. I can also see it from my desktop PC running linux mint 17.3 and again it prints with no issue. On my T400 I had Linux mint 18.1 and again that found the printer and it worked perfectly. Only now I have elementary on this laptop it is not found. Elementary does list the printer but that id directly from the NAS not the virtual machine. Any suggestions would be appreciated.