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I have tried twice to upgrade to 12.04 LTS and on both occasions get the above error message. I have read all the stuff on this and nothing works.

I have now tried a clean install from a downloaded disc and everything is fine but I am concerned about installing updates as clearly one of them will start the problem again.

Any suggestions as to what causes the problem and is there a likely update that should be avoided?

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The most probable reason is a low memory work environment (When Ubuntu dosent have enough space to load everything.

What YOU can do:

1) Insert an ubuntu CD/DVD 2) Restart and use the BIOS (Basic Input/Output System)

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Thanks for comment, but I don't think that was the problem. I have now tried a clean install and only accepted security updates, and to date have had no further problem. – Mick Clarke Sep 19 '13 at 14:44

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