"Too many failed attempts" printing error

http://brainextender.blogspot.com/2009/01/ubuntu-intrepid-too-many-failed.html

1. Stop the cups daemon to prevent cups from reseting your modifications
sudo /etc/init.d/cups stop

2. Edit your cups configuration with the editor of your choice and comment out these lines
sudo gedit /etc/cups/printers.conf

#AuthInfoRequired username,password

EDIT: (delete the above line)

To prevent cups to place thoose lines again in your config file you may want to make it immutable with
sudo chattr +i /etc/cups/printers.conf

3. Start cups again
sudo /etc/init.d/cups start

4. Try to print with gedit - it should work now.