cannot upgrade to ubuntu 11.04 beta 2
 

I have installed ubuntu 10.10 using wubi its working fine but iam not getting upgraded to newver version after pressing Alt+f2 and filling update-manager -d I am getting the massage that no such file in the dictionary found.

By default, beta versions are not available through update manager. You can go to http://www.ubuntu.com/ if you want to download and install manually. However, the full release version will be available in 8 days, at which time update manager will offer to upgrade.

Actually, you can do an upgrade today. Open a terminal window and type:

sudo update-manager -d

and supply your root password, then follow the directions.