[Bug 890738] [NEW] Downgrading ubuntu from v11.10 to v11.04 fails

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I downgraded ubuntu from v11.10 to v11.04 because of the well-known
nvidia driver bug, which prevents dual monitors being used. The
installation fails.

Your reporting system only allows one file to be attached to the report. I have attached the /var/log/syslog, since this indicates the problem:
mkdir: cannot create directory `/target/var/lock': File exists

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New

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Downgrading ubuntu from v11.10 to v11.04 fails 
https://bugs.launchpad.net/bugs/890738
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