"Session Menu" and "Me Menu" are missing after upgrade

Solution 1:

Try this:

Open terminal by pressing Ctrl+Alt+T and run these commands one by one.

sudo apt-get purge indicator-session

sudo apt-get install indicator-session

Then press Alt+F2 and run the following command to reset the Unity.

unity --reset

Solution 2:

After these commands, the upper half of my screen was scrambled, like a graphic card problem. Then terminal window was partly visible. Then terminal window, top tool bar and launcher came back, but launcher still scrambled. After mouse over launcher, it recovered too. But the problem remained: no icon (gear) for shutdown menu.

I found a solution: Using Software centre, Remove myunity. Start System settings, From the Personal category, choose Appearance, Change Theme to Radiance (Ambiance was the theme before)