software-properties-gtk crashed with ValueError in remove(): list.remove(x): x not in list

[DapperD]

install process lacks several bugs ( "alternate" AND desktop : wrong mirrors )

ProblemType: Crash
DistroRelease: Ubuntu 11.04
Package: software-properties-gtk 0.80.9
ProcVersionSignature: Ubuntu 2.6.38-8.42-powerpc64-smp 2.6.38.2
Uname: Linux 2.6.38-8-powerpc64-smp ppc64
Architecture: powerpc
Date: Sun May 1 09:09:12 2011
ExecutablePath: /usr/bin/software-properties-gtk
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 11.04 "Natty Narwhal" - Release powerpc (20110427.1)
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk --open-tab 2 --toplevel 52428803
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-properties-gtk', '--open-tab', '2', '--toplevel', '52428803']
SourcePackage: software-properties
Title: software-properties-gtk crashed with ValueError in remove(): list.remove(x): x not in list
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.