crashes after ubuntu 11.10 installation from ISO live image

[Leju Kurian]

Gives an error that installer was unable to unmount a device (/dev/sda6) and then it continues the installation process.
But at the end when the installation is finished (or shown as finished) I clicked the continue testing button, then it says it is crashed. Hopefully the package is ubiquity.

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 x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CasperVersion: 1.287
Date: Sun Dec 18 19:03:44 2011
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 LANGUAGE=en_IN
 PATH=(custom, no user)
 LANG=en_IN
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Dec 18 19:03:34 ubuntu plugininstall.py: Traceback (most recent call last):
Dec 18 19:03:34 ubuntu plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 256, in start
Dec 18 19:03:34 ubuntu plugininstall.py: self.db.progress('START', 0, 100, self.title)
Dec 18 19:03:34 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/debconf.py", line 60, in <lambda>
Dec 18 19:03:34 ubuntu plugininstall.py: lambda *args, **kw: self.command(command, *args, **kw))
Dec 18 19:03:34 ubuntu plugininstall.py: File "/usr/lib/python2.7/dist-packages/debconf.py", line 81, in command
Dec 18 19:03:34 ubuntu plugininstall.py: status = int(status)
Dec 18 19:03:34 ubuntu plugininstall.py: ValueError: invalid literal for int() with base 10: ''
Dec 18 19:03:34 ubuntu plugininstall.py:

[Launchpad Janitor (janitor)]

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