I had Ubuntu 9.04 and first let the system do the upgrade to 9.10.
This left me with the "black hole" as in my screen-shot.
I figured to do a clean install from a fresh downloaded .iso.
At first sight everything seems to work, and the update manager says I'm up to date so...
But I always liked the desktop wallpapers Ubuntu added, I wonder where it left ?
Just letting you know !