I just upgraded from Ubuntu 11.10 to 12.04 on an HP Mini netbook, and I have quite an annoying problem: there is no mouse cursor. On the login screen, I can see the cursor, but I cannot move it (neither with the USB mouse, nor with the touchpad). After I login, the cursor disappears.

I also installed on a virtual machine, on a different computer, and there everything works fine.

Does anyone else experience this?

Or do you know how I could fix this?