The problem is that the kernel made your printer available under the
device file /dev/usb/lp0 when your print queue was created. On the
current session (boot) your printer got assigned /dev/usb/lp1 but the
queue is configured for /dev/usb/lp0.
Do you have more than one printer? In this case the first to be turned
on gets /dev/usb/lp0 and the second /dev/usb/lp1. If both are turned on
during boot the assignment is random. This is an old problem and there
fore the USB backends of CUPS ("usb") and of HPLIP ("hp") base the
printer URIs on the printer's device IDs and serial numbers, making sure
that each print queue is always assigned to the same printer, the one it
was originally intended for. Unfortunately, Canon did not take care of
this by their "cnusb" backend, the one you are using.
So please make sure that when you boot your printers are turned off and
after booting turn on the Canon first. If you have more than one
computer, do not connect any other printer to the computer to which you
connect your Canon printer. Connect your other printer to another
computer and share it over your local network (some routers and NAS
systems also have a USB port to make a network printer out of a USB
printer, connect your other printer there and on your computer set it up
like a netwoprk printer, do not connect your Canon printer to the router
or NAS as it needs its special backend).
This is a problem of Canon's printer driver and not a bug of Ubuntu. So
we cannot fix this. Please contact Canon.
** Changed in: cups (Ubuntu)
Status: New => Won't Fix
** Summary changed:
- Printer MF3010 reports not connected
+ Printer MF3010 reports not connected (Canon's CUPS backend uses /dev/usb/lp0,
not safe if more than one USB printer is used)
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https://bugs.launchpad.net/bugs/1185309
Title:
Printer MF3010 reports not connected (Canon's CUPS backend uses
/dev/usb/lp0, not safe if more than one USB printer is used)
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