If you have only one printer on USB (the LJ4 with adapter cable) can you try as a workaround to open system-config-printer and choose the option to enter an URI. Enter the URI
parallel:/dev/usb/lp0
the manually choose manufacturer and model of your printer and complete setting up the print queue. Can you print using this new print queue?
Can you run
/usr/lib/ cups/filter/ usb
in a terminal window and post the output here?
If you have only one printer on USB (the LJ4 with adapter cable) can you try as a workaround to open system- config- printer and choose the option to enter an URI. Enter the URI
parallel: /dev/usb/ lp0
the manually choose manufacturer and model of your printer and complete setting up the print queue. Can you print using this new print queue?