Network Manager problemPosted: June 18, 2010
There is a bug in Kubuntu (lucid) which prevents knetworkmanager from loading and almost every attempt to load knetworkmanager failed. One cannot connect to both wired or wireless networks without this.
This bug is caused if you hibernate your system (lucid). Knetworkmanager simply refuses to load even after many rebooting attempts. The wireless led refuses to light up too.
This can be rectified by going to NetworkManager.state in /var/lib/NetworkManager and changing value of NetworkingEnabled from false to true. Then reboot the system. Everything will start working properly again.
Go to /var/lib/NetworkManager
Change the value of NetworkingEnabled from false to true
Reboot your system
Good Luck !