I’ve had a lot of trouble with Ubuntu 11.04 (Natty Narwhal) on a laptop (ThinkPad 420), and I’ve had problems including:
- Not being able to use dual monitors,
- Random logoffs.
I tentatively think I was able to solve them with two easy fixes:
- Turn off Unity. You can do this in the login screen.
- In the Update Manager, under “Settings”, check “Proposed updates”.
With the proposed updates, Unity may be working; try that at your own risk. With that, I have a reasonably stable system.