[ubuntu] Running in low graphic resolution

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http://ubuntuforums.org – Help!!! My computer will not boot 12.04. I get a dialog saying "running in Low graphic resolution and asks me to reconfigure the graphic card I have tried to boot in recovery mode and tried the advice of other forum treads to no avail. I enable networking but am not sure if I am on the internet as when I try a get-apt command it always says "unable to connect". Also I get a line that says something like "unable to write /var" I am using a HP compaq nc63200 with a mobile Intel 945 express chipset family graphic card. I have a duel boot and the windows works fine A (Hardware)