So, today I had this random annoying problem when I was browsing the web with Firefox. One minute the internet was fine, the next minute the internet was gone and on top of that the network-manager applet stopped working (even when I restarted the computer, it persisted). The nm-applet was greyed out and it said "Networking disabled". If anyone ever has this problem, I hope this solution will find you well. I looked all over Ubuntu forums (many people had the same problem as me), but the forum's answers didn't work for me.☺
Thank yous go to Praveen, the dude came up with it: http://www.geekyard.com/os/linux-os/fix ... ntu-10-04/
So basically, you open up the terminal and type in these commands
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service network-manager stop
service network-manager start
The problem was fixed immediately for my case, but you may need to restart the computer.