ubiquity crashed with DebconfError in command(): (10, "debian-installer/fallbacklocale doesn't exist")

[Doug McMahon]

Binary package hint: ubiquity

This is what's happening with the 03/16 iso
At first the message that the installer failed, a session will be started, ect. Trying to install from the live cd session causes this.

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 09:08:24 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/3914/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: