Upgrade to 12.04 Alpha 1 Failed, Ubiquity Error

[Keith Drummond]

I downloaded the 12.04 Alpha daily build and created a startup usb in 11.10. As usual I ran the startup usb, went through the usual steps of preparing Ubuntu for install (in this case I choose upgrade 11.10 to 12.04 from the options). I was connected to the internet and included the media option. Ubuquity ran and seemed to complete the install process, but at the end instead of getting the 'restart' message I got an error saying the installer had failed.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.9.5
ProcVersionSignature: Ubuntu 3.2.0-2.5-generic 3.2.0-rc3
Uname: Linux 3.2.0-2-generic x86_64
ApportVersion: 1.90-0ubuntu1
Architecture: amd64
CasperVersion: 1.292
Date: Fri Dec 23 06:02:35 2011
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20111129.1)
ProcEnviron:
 LANGUAGE=en_IE.UTF-8
 PATH=(custom, no user)
 LANG=en_IE.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Dec 23 06:02:13 ubuntu plugininstall.py: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Dec 23 06:02:13 ubuntu plugininstall.py:

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 850264, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.