Please try this (it's all one line):
strace -s100 python -c "import hpmudext; print hpmudext.make_usb_uri('002','004')"
Replace 002 and 004 with the USB bus/device as before. Hopefully this will tell us why it isn't spotting the printer.
Please try this (it's all one line):
strace -s100 python -c "import hpmudext; print hpmudext. make_usb_ uri('002' ,'004') "
Replace 002 and 004 with the USB bus/device as before. Hopefully this will tell us why it isn't spotting the printer.