OK, so it would be nice if /dev/bus/usb/* would be owned by group lp,
then we could have the backend run as user lp again, instead of root.
Could folks please try whether this rule makes the printer device owned
by root:lp ?

ACTION=="add", SUBSYSTEM=="usb", ATTR{bInterfaceClass}=="07",
ATTR{bInterfaceSubClass}=="01", GROUP="lp", MODE="660"

(add it to e. g. /etc/udev/rules.d/cups.rules)

** Changed in: udev (Ubuntu Karmic)
   Importance: High => Wishlist

** Changed in: udev (Ubuntu Karmic)
       Status: Invalid => Triaged

-- 
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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