CUPS, USB printers & "Permission Denied"

Micah micahjon at
Mon Jun 26 01:05:53 UTC 2006

Anthony Agelastos wrote:
> Hello and thank you for the very quick reply.
> On Jun 25, 2006, at 7:34 PM, albi wrote:
>> On Sun, 25 Jun 2006 19:28:35 -0400
>> "Anthony Agelastos" <iqgrande at> wrote:
>>> I updated CUPS and I cannot print to my USB laser printer. The web
>>> interface shows the following:
>>> hp_LaserJet_1160Le (Default Printer) "Unable to open USB device
>>> "usb:/dev/ulpt0": Permission denied"
>>>     Description: Hewlett-Packard LaserJet 1160Le
>>> Location: Den
>>> Make and Model: HP LaserJet 1160 Foomatic/hpijs (recommended)
>>> Printer State: stopped, accepting jobs, published.
>>> Device URI: usb:/dev/ulpt0
>> are the permissions on /dev/ulpt0 correct ?
> I have no idea what it is supposed to be.
> %ls -l /dev/ulpt0
> crw-r--r--  1 root  operator    0,  68 Jun 25 19:01 /dev/ulpt0
>> if the printer runs fine as root you know it's likely a
>> permission-problem
> What's the best way to run it as root? When I log into the CUPS web 
> interface as root and try to print a test page, it gives me the message 
> I posted above. If, as root, I try to print a Postscript file via lp, it 
> does nothing.
> Thank you all again for your 
> assistance._______________________________________________

I had the same problem. chown ulpt0 to group cups and add group write. 
That will fix it. I added the following to /etc/devfs.rules to make the 
fix permanent:

add path 'unlpt*' mode 0660 group cups
add path 'ulpt*' mode 0660 group cups

Don't forget to restart devfs.


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