Amir, the two URIs are for two CUPS backends, the usb:/... is for the
generic USB backend coming with CUPS. Using this backend you cannot scan
or check ink levels. The hp:/... URI is for the HPLIP CUPS backend which
is part of HPLIP. This backend enables support for the full
functionality of HP's printers and multi-function devices. So you have
to generally prefer this one.
In your case the HPLIP backend is used and it does not succeed to
communicate with your printer. You can try the usb:/... URI to try the
other backend.
Please post also the output of
ls -l /dev/usb/lp* /dev/bus/usb/*/*
lsusb
lpinfo -v
cp-check -r
The problem is most probably an upstream problem of HPLIP, adding HPLIP
upstream task ...
** Package changed: cups (Ubuntu) => hplip (Ubuntu)
** Also affects: hplip
Importance: Undecided
Status: New
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CUPS does not print to HP OfficeJet-G85
https://bugs.launchpad.net/bugs/576491
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