[gnome] restore gnome system menu on the right

Hi,
I am using ubuntu -16.04 gnome-flashback-session , accidentally I deleted the system menu on the right on the top panel (network icon time display, sound setting all got removed), now i want to restore the menu back,

I tried removing gnome and reinstalling it again, tried to purge the config, but that did not work. Now can i restore the panel?

Thanks
Abhijit

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[gnome] restore gnome system menu on the right