This is a simple tutorial about how to get “power off” and “Restart” options in gnome-shell user account menu.
When I first time using Gnome 3, I didn’t find shutdown/restart button anywhere. I shut down and reboot my machine via command in terminal. You might get the same problem if you’re new to gnome-shell. And here’s a tip to figure it out:
Click on the user account at top-right corner. And press down Alt key, you’ll see the downmost option “Suspend” becomes “Power Off…”.
Click on it and you’ll see shutdown/restart options.