As your Feisty to Gutsy upgrade seems to go wrong, I suggest you to ensure that all package are properly installed and if there are broken packages, to reinstall them all.
You can do that by accessing System / Administration / Synaptic
Click on Custom Filters ( at the left of the window ) and click on Broken ( at the left-top of the windows ).
You'll see the list of the broken packages which you may reinstall.
Thanks for your bug report
As your Feisty to Gutsy upgrade seems to go wrong, I suggest you to ensure that all package are properly installed and if there are broken packages, to reinstall them all.
You can do that by accessing System / Administration / Synaptic
Click on Custom Filters ( at the left of the window ) and click on Broken ( at the left-top of the windows ).
You'll see the list of the broken packages which you may reinstall.