program error in debconf.py after UserInfo step

[piotr]

this bug probably is related to another one I'll report. these two don't allow me to install.
I started the ubuntu-session from the cdimage. (I booted with the files of that image located on sdb1)
there I started "Install Ubuntu 12.04 LTS" after adding the "-d" parameter.
while the data was still copying I submitted UserInfo.
then that UserInfo was replaced by a white page and the program did end.
the data wasn't copied to the end, there was a lot left and the hdd just stopped working.
I can see a waiting-cursor on screen.

if I do the same in the actual installer, boot directly into ubiquity, it doesn't work either.
however, then lightdm will quit and I see a black screen.
I can use the consoles though.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.10.16
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic-pae 3.2.14
Uname: Linux 3.2.0-23-generic-pae i686
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
CasperVersion: 1.315
Date: Thu Jul 26 14:30:37 2012
InstallCmdLine: file=/cdrom/preseed/ubuntu.seed boot=casper iso-scan/filename=/ubuntu-12.04-desktop-i386.iso quiet splash --
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[piotr (piotr5)]

https://bugs.launchpad.net/bugs/1029488 is the related bug I mentioned.

[piotr (piotr5)]

ubuntu-12.04.1-desktop-i386.iso fixed this problem.
I also tried the other situation.