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I have the same problem as Network Manager Applet menu freezes and does not respond in ubuntu 12.04.
Now, even restarting the nm-applet won't help.
Is it a bug? I thought 12.04 would be pretty stable now.
What could I do then?

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Please file a bug report in Launchpad against the network-manager-applet package. – jdthood Dec 21 '12 at 8:14
@jdthood it's already there – manuzhang Dec 21 '12 at 9:41
This question should instead be filed as a bug report, and as such is off-topic, thanks! Instructions on filing a bug report are here. This comment is for reference – Seth Jan 28 '13 at 4:14

I think I am still having a similar bug on my 12.04 LTS system. For now, restarting nm-applet works for me, as described in this link.

alex@alex-desktop:~$ ps -A | grep nm-applet
21903 ? 00:00:00 nm-applet
alex@alex-desktop:~$ kill 21903
alex@alex-desktop:~$ nohup nm-applet &
[1] 22476
alex@alex-desktop:~$ nohup: ignoring input and appending output to `nohup.out'

Certainly this is not a fix, but it's a quick way to get nm-applet working again (for me). In fact, when I'm lazy, I can just start a new instance of nm-applet without killing the old one. Maybe someone call tell me why that's a dangerous idea, but for now it's helping!

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