apt-clone crashed with SystemError in commit(): installArchives() failed

[Monkey]

Binary package hint: ubiquity

I was updating to Ubuntu 11.04 (from Ubuntu 11.04 Alpha 2) without erase my data but the installer suddenly was frozen. After that, I have to cancel the installation and a popup with this report appeared.

Direct download : http://cdimage.ubuntu.com/daily-live/20110302/natty-desktop-i386.iso
MD5Sum : beee514d4b2fdd8d97ddb8cf7d21d3ec

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: ubiquity 2.5.22
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic i686
Architecture: i386
Date: Wed Mar 2 17:30:01 2011
ExecutablePath: /usr/share/ubiquity/apt-clone
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110302)
ProcCmdline: /usr/bin/python /usr/share/ubiquity/apt-clone restore-new-distro /target/ubiquity-apt-clone/apt-state.tar.gz natty /target
ProcEnviron:
 LANGUAGE=es_ES.UTF-8
 PATH=(custom, no user)
 LANG=es_ES.UTF-8
 SHELL=/bin/bash
 LC_COLLATE=C
PythonArgs: ['/usr/share/ubiquity/apt-clone', 'restore-new-distro', '/target/ubiquity-apt-clone/apt-state.tar.gz', 'natty', '/target']
SourcePackage: ubiquity
Title: apt-clone crashed with SystemError in commit(): installArchives() failed
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[dino99 (9d9)]

natty have reached EOL now