ubiquity crashed when trying to run the installer on the LiveCD

[SonicDeathMonkey]

Binary package hint: ubiquity

On booting from the 11.04 liveCD, an error is reported to the screen after a hang of maybe 5 mins. Then I'm dropped into a desktop session (installer told me this was going to happen) when running 'install ubuntu 11.04 from the desktop, I get the ubiquity crash and am unable to proceed. I've attached syslog as directed, but I couldn't find partman anywhere :(

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: ubiquity 2.5.26
ProcVersionSignature: Ubuntu 2.6.38-6.34-generic 2.6.38-rc7
Uname: Linux 2.6.38-6-generic i686
Architecture: i386
Date: Wed Mar 16 19:45:40 2011
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110316)
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity gtk_ui
ProcEnviron: Error: [Errno 13] Permission denied: '/proc/3400/environ'
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
SourcePackage: ubiquity
Title: ubiquity crashed with DebconfError in command(): (10, "debian-installer/fallbacklocale doesn't exist")
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[EricDHH (ericdhh)]

Testing natty 11.04 n thinkpad t42 for you.

With todays updates the installed 11.04 get hosed, several mount errors that stop the whole bootup in standard and save mode. So i decide to do a fresh install, used the 16.03.2011 iso image on a usb stick.

The desktop shows some crashes from compiz, but ubiquity is unstartable. If the icon was clicked, the waiting pointer disappears after 5 seconds and a requester told about the crash. In this state the installed 11.04 is lost and a new one cannot be installed. Waiting for the next iso.......

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #445499, so 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.