~$ /usr/lib/cups/backend/hp direct hp:/usb/Deskjet_5400_series?serial=TH56O121PD047N "HP Deskjet_5400_series" "hp:/usb/Deskjet_5400_series?serial=TH56O121PD047N"
# /usr/lib/cups/backend/hp direct hp:/usb/Deskjet_5400_series?serial=TH56O121PD047N "HP Deskjet_5400_series" "hp:/usb/Deskjet_5400_series?serial=TH56O121PD047N" ii hplip 0.9.7-4ubuntu1 HP Linux Printing and Imaging System (HPLIP) hp-levels works even as user. So it is probably not permission related. -- hplip cannot find DeskJet 5440 printer, despite CUPS's claims to the contrary https://launchpad.net/bugs/49107 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs