I installed Mint 7 over Ubuntu 9.04. Smooth as silk, applications installed under Ubuntu are even running properly. Wi-fi started with no tweaks. Very nice.
The only thing is, I still have the Ubuntu menu (but with Mint items). My question is: how can I replace it with MintMenu.
SOLVED: Never mind - right-click panel > Add to Panel > select MintMenu > Right click Ubuntu/Gnome menu in the Panel > choose Remove from Panel.