Same here. My printer was working fine before I upgraded to karmic, then
stopped working after the distribution update.

First, the printer was not seen by CUPS. Solved it by:
 - blacklisting usblp kernel module
 - changing group of /dev/bus/usb/00x/00y device
 - not letting apparmor supervise cupsd operation
as adviced here.

So I was able to add my printer into cups. But printing a test page does
not work. The print job shows up in print queue, but never ends. In the
list of processes I see :

lp        9520  0.0  0.0  48596  1832 ?        S    17:07   0:00
usb://EPSON/Stylus%20DX7000F?serial=B05P108062510410&interface=1 638
root motd 1 finishings=3 media=iso_a4_210x297mm number-up=1 job-
uuid=urn:uuid:1f86a76d-d133-3cf5-5dbf-77e34bd688bd job-originating-host-
name=localhost

It does not matter whether in 2.6.28 or 2.6.31 kernel.

I hope that helps.

-- 
usblp Kernel module needs to be removed and /dev/bus/usb/*/* made accessible 
for USB printers to work with CUPS 1.4.x
https://bugs.launchpad.net/bugs/420015
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