This bug seems to be similar to # 990388. I found an easy workaround in
askubuntu (you need to set up your printers again on a precise desktop),
which I posted also here:
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/990388/comments/15
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Fix as described in askubuntu #7 worked for me. I copy it here for
reference with some adaptions, credits go to RobDavenport.
== Set up printer shared on a sambe network with authentication ==
Choose Add new printer in Printing, click open 'Network Printers',
select 'Windows Printer via SAMBA
