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I had this problem after I changed graphics drivers. My solution was: 1) Press ALT-F2 2) Type "xfce4-panel --preferences" and press return. This brings up the panel preferences. 3) Under "Output", make sure that it is selected to show up on the right monitor. It might be selected to show up on an external video output or some other non-existing monitor. ...


Due to lack of information (Ubuntu Version, Window Manager, believed cause of error, etc.) this is just a shot in the dark: NOTE: ~/.config holds a lot of other config; SO DO A BACKUP FIRST! It could be a broken gnome/unity config (assuming you use unity). You could try renaming your ~/.config folder mv ~/.config ~/my_config_back then logout and login ...

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