If the workaround presented in my previous comment does not work for
you, try the following:

Get cups_1.3.9-16ubuntu1~ppa1 from my PPA. It contains a USB backend
which is based on libusb, taken from CUPS 1.4.x. Note that the package
is only for testing and therefore not perfect. You have to do the
following manual steps:

1. The AppArmor configuration is not prepared for the access via libusb,
deactivate AppArmor for CUPS with

sudo aa-complain cupsd

2. The usblp kernel module blocks the access for the new USB backend.
You need to deactivate it. Add a line "blacklist usblp" to the
/etc/modprobe.d/blacklist.conf file and run

sudo rmmod usblp

Now the module is unloaded and will not get reloaded if you plug in or
power-cycle a USB printer or if you reboot.

With all this done, try setting up your printer with the "usb" backend
(not HPLIP or HAL, nor my first workaround) and see whether it prints or
not.

This is the last mean. If this does not work, the only cause of the bug
can be the kernel. We tried so many backends now.

-- 
Printer (HWModel Name) May Not Be Connected
https://bugs.launchpad.net/bugs/348316
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