ubiquity-dm crashed with ValueError in command(): invalid literal for int() with base 10: ''

[tuxayo]

Binary package hint: ubiquity

Natty iso->LILI USB creator->USB key

Intalling:
ext 4 formated partion were / is mounted
no swap

After setting user account at the begening of the diaporama, the copy ends and then:
The exact message in french:
"Une tentative de configuration d'ATP pour installer de nouveau paquets depuis me CD à échoué."

Approximate translation:
"An APT configuration attempt to install new packets from CD has failed"

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: ubiquity 2.6.5 [modified: lib/partman/automatically_partition/question]
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
Date: Sat Apr 16 23:29:02 2011
ExecutablePath: /usr/bin/ubiquity-dm
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110416)
ProcCmdline: /usr/bin/python /usr/bin/ubiquity-dm vt7 :0 hostname /usr/bin/ubiquity --only
ProcEnviron:
 LANGUAGE=
 PATH=(custom, no user)
 LANG=fr_FR.UTF-8
PythonArgs: ['/usr/bin/ubiquity-dm', 'vt7', ':0', 'hostname', '/usr/bin/ubiquity', '--only']
SourcePackage: ubiquity
Title: ubiquity-dm crashed with ValueError in command(): invalid literal for int() with base 10: ''
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[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 #652916, 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.