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KDE network manager disabled

Submitted by Druss on Sat, 2011-12-31 15:45

One of my laptops which is running on Kubuntu Lucid decided to stop connecting to my network today. I found that the KDE network-manager applet (or is it a plasmoid? :S) had decided to disable itself. Clicking it stated so with no option to re-enable it (nice UI, boys). Getting to the commandline and starting the network-manager service did not help. I also found that accessing the System settings networking configuration gave me corrupt XML file errors.

So, off - as I frequently do on this site - I went to make an offering to the Search Engine Deities of today and came back with the explanation that this was caused due to corruption triggered by placing the laptop in "sleep mode". The fix is to:

  1. Get to the command line.
  2. Delete a network-manager "lock" file using sudo rm -f /var/lib/NetworkManager/NetworkManager.state .
  3. Restart the service through sudo /etc/init.d/network-manager restart

That did the trick for me and hopefully will for you too!