Installation of Edubuntu 11.10 from an USB-memory stick crashes. Lanaguage: Swedish. Tested with diferent hardware and USB. Step that crashes "Search for packets to install"

[Anders Hälltorp]

See summary

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ubiquity 2.8.7
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
ApportVersion: 1.23-0ubuntu3
Architecture: i386
CasperVersion: 1.287
Date: Sat Dec 3 19:15:48 2011
LiveMediaBuild: Edubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
ProcEnviron:
 PATH=(custom, no user)
 LANG=sv_SE.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Dec 3 18:57:11 ubuntu plugininstall.py: Traceback (most recent call last):
Dec 3 18:57:11 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1641, in <module>
Dec 3 18:57:11 ubuntu plugininstall.py: install.run()
Dec 3 18:57:11 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Dec 3 18:57:11 ubuntu plugininstall.py: func(self)
Dec 3 18:57:11 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 169, in run
Dec 3 18:57:11 ubuntu plugininstall.py: self.install_language_packs()
Dec 3 18:57:11 ubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 613, in install_language_packs
Dec 3 18:57:11 ubuntu plugininstall.py: self.do_install(self.langpacks, langpacks=True)
Dec 3 18:57:11 ubuntu plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 716, in do_install
Dec 3 18:57:11 ubuntu plugininstall.py: mark_install(cache, pkg)
Dec 3 18:57:11 ubuntu plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 489, in mark_install
Dec 3 18:57:11 ubuntu plugininstall.py: assert cache._depcache.broken_count == 0
Dec 3 18:57:11 ubuntu plugininstall.py: AssertionError
Dec 3 18:57:11 ubuntu plugininstall.py: