systray disappeared

Question

running ubuntu 12.04 - all well after installation - looking for some options in compiz do organize expo and other desktop stuff, now systray-panel (= program-menus cant be shown and icons unvisible and no logoff,...) is not drawn at the top of screen/desktops the launcher at left doesnt appear while moving mouse to then left any programs can only be started via command-line by getting a terminal with ctrl-alt-T

how can I start/show it again?

Answer 1

Reset unity using this command line

unity --reset

This will reset all unity setting to default.

or

ccsm

Answer 2

Open compiz config settings manager from a terminal using the command

ccsm

Then go to the desktop section and click on the unity desktop plugin and select enable.

After a few seconds the top & side bars should re-load.