Network On Ubuntu disabled (Solved)

Suddenly network on my ubuntu laptop got disabled due to poweroff on battery discharge. 

I searched at various places in menu but didnt get how to work it out.

Thanks to following link from google, Network recovered.
 from Ubuntu Geek

If your network manager is not working, and says unmanaged, or Networking disabled in ubuntu 10.04 try this fix
Open the terminal from Applications menu -> Accessories -> Terminal run the following commands

service network-manager stop

rm /var/lib/NetworkManager/NetworkManager.state

service network-manager start

Only thing here is I didnt need to reboot to make it work. it just workd.