Comment 2 for bug 1635005

It's probably bug #1630063. The system seems to lock up because the keyboard and/or mouse are plugged into the same USB hub as the printer. If you can plug them differently, only the printer will lock up. Running "lsusb" in a terminal will show which hub the devices are connected to. If you can still type after a lockup, then the typing "dmesg" in a terminal may show ohci-pci errors.