I did and upgrade from (K)ubuntu 12.04 to 12.10. It all worked well -- except for Gimp.
Gimp 2.8 works fine but loading a .NEF file (a raw file from Nikon) fails with the message
Opening '/path/to/file/DSC_2605.NEF' failed:
Procedure 'file-ufraw-load' returned no return values
How do I find out what is wrong and how do I fix this?