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I was foolish to upgrade my computer to lucid, and i got into a lot of errors, it will not boot proper the display.

This is why i want to downgrade back to Karmic.

Do you know how can you do this?

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up vote 1 down vote accepted

^agreed. However, I was able to re-install without losing essential data. I have explained it here:

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Restore from the backup you made before upgrading? You made a backup right?

Seriously, you probably need to backup your data/configuration format and reinstall. There is no supported way on a Debian/Ubuntu based system to downgrade.

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