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.

  • 1
    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

However, if gksudo is not found, try:

sudo -H system-config-printer
| improve this answer | |
  • 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've tried that with the following results:- – hal_v Apr 30 '18 at 21:27
  • Sorry these results:-(system-config-printer:3620): Gtk-CRITICAL **: 07:26:04.797: gtk_tree_store_insert_after: assertion 'G_NODE (sibling->user_data)->parent == G_NODE (parent->user_data)' failed (system-config-printer:3620): Gtk-CRITICAL **: 07:26:04.797: gtk_tree_store_set_value: assertion 'VALID_ITER (iter, tree_store)' failed (system-config-printer:3620): Gtk-CRITICAL **: 07:26:04.797: gtk_tree_store_set_value: assertion 'VALID_ITER (iter, tree_store)' failed – hal_v Apr 30 '18 at 21:27

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.

| improve this answer | |

Adding my username to lpadmin as suggested worked for me (as suggested by msanderz). Here is how you add yourself to the group:

sudo usermod -a -G lpadmin YOUR_USERNAME
| improve this answer | |

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