Many thanks for this - it has helped me enormously. I think it is the solution to an intermittant printing problem I have in 12.10.
However, the magic only lasts until the next reboot. After it has rebooted the intermittant problem returns.
I can see a list of items on the USB hub, similar to those listed in your last post, like this:
What do you mean by "Apparently if I make "lp" the group, and add write access to the group:
ogp@desktop:/dev/bus/usb/004$ ls -l
crw-rw-r-- 1 root root 189, 384 Feb 12 14:29 001
crw-rw-r--+ 1 root root 189, 385 Feb 12 14:29 002
crw-rw-rw- 1 root lp 189, 386 Feb 12 18:54 003
there is no need to chmod again." Is this the permanent solution to the problem?