How can I restore Network Indicator in Unity Panel?
Solution 1:
It can be reinstalled!
Hit Alt+Ctrl+T to open terminal and run following commands one by one:
sudo apt-get purge network-manager-gnome
sudo apt-get install network-manager-gnome
Restart your system for the change to take effect.
That's it!
Solution 2:
I found this solved my problem on Ubuntu 12.04
sudo apt-get install indicator-applet-complete