Thanks for the info. The key worked for me is Alt+Super(WindowI installed gnome panel in my Ubuntu 12.04 to customize the desktop
appearance. After few days I can?t able to see the power button, date and
network connection gui in the panel.
In the login screen, If I change the option from Gnome-GUI to unity it
restores to default GUI screen of Ubuntu.
I googled this error and getting solution like right click the panel and
add the Indicator menu option. But in my pc if I right click the panel
nothing happens.
This is probably a stupid suggestion. But, nevertheless, Did you try Alt
+<right-click> ? I read somewhere about using Alt +<right-click> for
Gnome-3, or was it Ctrl +<right-click> ? Anyways, try one of them, it
may work.
key)+Rightclick.