ubiquity crashed with InstallStepError in configure_user()

[David Turenne]

Binary package hint: ubiquity

I tried to install Intrepid with an existing home partition.
as far as i know, this do not cause any bug....
maybe the group or permissions can be the source of the problem, maybe i changed them.
the install stopped and booted in live-cd mode.

ProblemType: Crash
Architecture: i386
DistroRelease: Ubuntu 8.10
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InterpreterPath: /usr/bin/python2.5
Package: ubiquity 1.10.10
ProcAttrCurrent: unconfined
ProcCmdline: /usr/bin/python /usr/lib/ubiquity/bin/ubiquity --only
ProcEnviron:
 LANGUAGE=
 PATH=/sbin:/bin:/usr/sbin:/usr/bin
 LANG=fr_FR.UTF-8
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', '--only']
SourcePackage: ubiquity
Title: ubiquity crashed with InstallStepError in configure_user()
Uname: Linux 2.6.27-7-generic i686
UserGroups: