Today i'll show you how to re-enable the network manager on Kubuntu 'Lucid'
After upgrading to Kubuntu 10.04 a couple of weeks ago, everything worked just perfect, but today, as i switched on my notebook i couldn't get online, neither by wlan nor by cable, a situation i just couldn't understand because it was working just a few hours ago.
After a few minutes of Google search i found out that this issue is known as bug #524454 and thank the Ubuntu community there's a simple solution to it:
Open up a terminal and start dolphin as root 'sudo dolphin' then navigate to /var/lib/NetworkManager/NetworkManager.state, this is a text file that you can open in your favorite text editor, if you were victim of this bug your network setting should be NetworkingEnable=false, just change 'false' to 'true', save the file and then let the command 'sudo restart network-manager' work it's magic... voila!