Clearly from the output of the command 'lsmod', g_printer module is
not loaded. This g_printer module is the driver for usb-printer.
As a root it can be installed with "modprobe g_printer" command. (or
"cd /lib/modules/`uname -r`/kernel/drivers/usb/gadget" and then as
root "insmod g_printer.ko")( Important note, for every reboot we have
to load this manually, if it is not automatically loaded by
scripts/utilities)
And the cups-pk-helper is an helper apps to configure printer. if it
is broken, we can use the "system-config-printer" utility to configure
printer. It can be installed from the repository. And it will not
broke the system.
--
Regards,
Sathishkumar D
http://flowersopenlab.weebly.com/