Comment 32 for bug 555571

@rmada: This is not a command, it is a file. You need to edit it with a text editor with root authorizations. For example (assuming you have KDE) run "kdesu kate" and enter your password. Then select File - Open and open "/var/lib/NetworkManager/NetworkManager.state". Now you can edit and save the file.

Marked this as not a duplicate of 524454, because there it is possible to enable the network by clicking on the KNetworkManager icon and enabling it. Seems to be a completely different issue (cause).

I had the same problem with Kubuntu 10.04 on my computer about a month ago (August 2010). Today it happened with my husband's computer. It happened after a reboot, not after suspend. Other than that It's exactly as described by others above:
- Both wired networking and wireless networking do not work.
- When left-clicking or right-clicking on the KNetorkManager icon, it says in gray "Netzwerkverwaltung deaktiviert" (which means network management disabled).
- There are no entries in that menu and no other point-and-click way to enable networking.
- Restarting KNetworkManager does not help.
- Rebooting the computer does not help.
- In /var/lib/NetworkManager/NetworkManager.state NetworkingEnabled is set to false.
- In the same file, WirelessEnabled is true, but WLAN does not work anyway.
- The workaround of editing /var/lib/NetworkManager/NetworkManager.state to change to NetworkingEnabled=true and then running sudo service network-manager restart works.