Thenk you all for your postings of the dnssd output. I have found the
problem now: It is caused by UTF-8 characters in the printer
descriptions of remote CUPS queues, especially from Mac OS X systems.

This prevents the new printer wizard of system-config-printer to work at
all if there is somewhere a CUPS queue in the network which uses UTF-8
characters in the printer description. This is nearly always the case if
there are Mac OS X machines. Even local printers cannot get installed
then. One can also see on the number of duplicates that this bug is of
high impact. Therefore I am raising the importance of this bug and
propose it as a freeze exception for Karmic.

The fix (patch attached) is a one-liner, no risk of regressions.

-- 
Freeze exception: system-config-printer.py crashed with UnicodeDecodeError in 
sub()
https://bugs.launchpad.net/bugs/437997
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