I have the same problem with a fresh installation of Karmic. Going to system -> 
preferences-> default printer i retrive the error message "Cups scheduler is 
not running", so I can't install any printer, as a result I can't print 
anything.
Searching on internet, I found same solutions, and all seems to be linked to 
'apparmor'. As specifyed on here:
http://linux.aldeby.org/no-more-printers-cups-not-running.html
the problem may be a bug in apparmor, probably: 
https://bugs.launchpad.net/ubuntu/+source/cups/+bug/392337
but I don't know if is this bug the cause of the problem in 'cups'.

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CUPS server error - "The CUPS scheduler is not running."
https://bugs.launchpad.net/bugs/478606
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