[ubuntu] Problems with restart in 12.10

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http://ubuntuforums.org – HI Whenever I update software and then asked to restart the computer (pressing the "Restart" button) my laptop closes as normal, but on restart hangs with a dark screen and a large flashing line in the top left hand corner. I then have to power down the computer by pressing the power button, restart then act as normal. I have tried the five options provided by the Upubuntu website but unfortunately none of them appear to work. Any advice please. Regards. Northwestern (Hardware)