This is a common problem with the unknown monitor. You can fix it manually. Open System Settings > Displays. In the Displays window, you will see an Unknown monitor. Click it and disable it. to remove this monitor follow this link http://askubuntu.com/a/365017/34385
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This is a common problem with the unknown monitor. You can fix it manually. Open System Settings > Displays. In the Displays window, you will see an Unknown monitor. Click it and disable it. to remove this monitor follow this link
http://askubuntu.com/a/365017/34385