[ubuntu] Ubuntu11.10 not working after upgrade

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http://ubuntuforums.org – Hi, I know there are many people who have experienced similar probs of upgrading then just getting a purple dead screen. But looking on other peoples posts I can't seem to find a solution for me. There are a lot of "hold the shift key down and then..." but mine does nothing when I do that but I can hit delete and go into bios. So, my version of the problem is: didn't get round to upgrading from 10.10, so got a msg saying there will be no more updates, paniced and clicked yes for going straight to 11.10 (so no 11.04). All went well during upgrade. Restarted it and now it stops a (Hardware)