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I got 12.04 LTS but it happened in 11.10 too. The thing is that the network icon disappears from tray without any warning. I've noticed it happens when the connection is weak and unstable, but I know it is just a graphical problem because it still works when it manages to reconnect automatically. When it doesn't, I can't find another way to put it back other than killing the X server or simply rebooting the OS. But come on, this is Linux, obviously there is a way to solve this. So

  1. How I make it not to disappear ever again?
  2. At least, what can I do to make it reappear (I suppose with a command in terminal)?
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Type ping www.google.com -s 1 in terminal and press enter as soon as you connect to the internet. The code will keep your connection alive without allowing it to drop automatically. If you are using a mobile broad band device, install 'BetaVine Connection Manager' and try to connect through that software. (for Huwawei devices, use Mobile Parner)

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Ok, I'll try that. But what can I do if the connection breaks? I know it will, because my WiFi network in the university is very unstable. By the way, I don't use mobile connections. – Javier May 4 '12 at 3:48
I am also facing the same problem with 12.04, whenever I am disconnected from Internet, after sometime the Network Manager Icon disappears from the Top Panel, but still the daemon or the service is running at the background. Going to Network, I am able to configure connections, but How can I exactly bring back the network manager Icon at the Top panel, or how can I avoid it from disappearing ? – Pras Jan 5 at 20:33

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