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I have 12.04 and have 2 printers installed, both wirelessly over my personal network, no printer sharing. When I try to modify the printers I get a window asking for authentication (username and password). For the life of me I cannot think what these might be. At first I thought it might be my Ubuntu account username and password, but I can't get it to work. The printer username and password (admin and access) doesn't work either.

Does anyone know what it is asking for, and how I can turn that off?

Many thanks.

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try the username & password which was set up first (when installing Ubuntu) – Uli Apr 9 '13 at 17:25

You might be affected by this bug:

try running

gksudo system-config-printer

in a terminal window, then setting up the printer

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Tried in Ubuntu 12.4.2 and it works. Thanks! – That Brazilian Guy May 29 '13 at 17:19
Tried in Ubuntu 13.10 and it works too. – raphie Mar 29 '14 at 3:44

I had a similar problem and solved it by adding my user name to the group "lpadmin" which allowed me to make changes in the printer. Since I have been trying to solve a different problem for about three days I do not remember exactly what I did. Try googling "ubuntu add user name to groups" for the sudo command to add your user name.

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