Upgraded Ubuntu from 8.10 to 9.04

This was on my Thinkpad T400 laptop, where Ubuntu is installed through Wubi.

After upgrade, X could not start. No GUI No Window Manager.

Followed the steps mentioned here.

The problem was with fglrx driver.

1) Go to Recovery mode during boot.
2) Choose to drop into Shell with networking support

and do

sudo apt-get remove xorg-driver-fglrx

Reboot. It started working for me.

First thing you will notice in 9.04 is the notification system it has. Nice eye candy stuff.