I just docked my laptop after a meeting upstairs. Unfortunately, it refused to come out of sleep mode so I was forced to reboot it.
On rebooting, KDE's network manager showed by network as "unmanaged" and I was left without any network connectivity - wired or wireless. After some more rebooting and swearing, I figured out the problem:
At hibernate time, Ubuntu tells the network manager that networking is disabled. If the system doesn't wake up or gets rebooted, that setting is not reversed.
I had to manually fix the problem by:
1. Opening /var/lib/NetworkManager/NetworkManager.state in vim
2. Changing "NetworkingEnabled=false" to "NetworkingEnabled=true"
3. Save the file
Voila! On reboot, everything is back to normal.
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