System installation crashes at "Installing System"

[Winter Ninjason]

This happened on Both 11.10 beta 2 and 11.10 daily build.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ubiquity 2.8.4
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: 1.285
Date: Mon Oct 10 08:44:44 2011
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20111009)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Ubuntu Foundations Team Bug Bot (crichton)]

Exception during installation:
Oct 10 08:44:36 ubuntu plugininstall.py: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Oct 10 08:44:36 ubuntu plugininstall.py:

[Launchpad Janitor (janitor)]

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

[Hans Peeters (hdps-een)]

Same here, only a bit earlier in the "Installing System" part, around 35%: "Installing languages"
These are the last lines from the SYSLOG

Mar 13 22:14:20 ubuntu ubiquity: debconf: DbDriver "templatedb": could not sync /var/cache/debconf/templates.dat-new: Input/output error
Mar 13 22:14:20 ubuntu ubiquity: dpkg: error processing man-db (--unpack):
Mar 13 22:14:20 ubuntu ubiquity: subprocess installed post-installation script returned error exit status 1
Mar 13 22:14:20 ubuntu ubiquity: No apport report written because MaxReports is reached already
Mar 13 22:14:23 ubuntu ubiquity: Processing triggers for shared-mime-info ...
Mar 13 22:14:30 ubuntu ubiquity: Processing triggers for hicolor-icon-theme ...
Mar 13 22:14:50 ubuntu ubiquity: Errors were encountered while processing:
Mar 13 22:14:50 ubuntu ubiquity: man-db
Mar 13 22:14:51 ubuntu ubiquity: Error in function:
Mar 13 22:14:51 ubuntu ubiquity:
Mar 13 22:14:51 ubuntu plugininstall.py: Exception during installation:
Mar 13 22:14:51 ubuntu plugininstall.py: SystemError: E:Sub-process /usr/bin/dpkg returned an error code (1)
Mar 13 22:14:51 ubuntu plugininstall.py:
Mar 13 22:17:01 ubuntu CRON[3343]: (root) CMD ( cd / && run-parts --report /etc/cron.hourly)
Mar 13 22:26:28 ubuntu ubiquity: ERROR:
Mar 13 22:26:28 ubuntu ubiquity: hook /usr/share/apport/package-hooks//source_ubiquity.py crashed:
Mar 13 22:26:28 ubuntu ubiquity:
Mar 13 22:26:28 ubuntu ubiquity: Traceback (most recent call last):
Mar 13 22:26:28 ubuntu ubiquity: File "/usr/lib/python2.7/dist-packages/apport/report.py", line 663, in add_hooks_info
Mar 13 22:26:28 ubuntu ubiquity: symb['add_info'](self, ui)
Mar 13 22:26:28 ubuntu ubiquity: File "/usr/share/apport/package-hooks//source_ubiquity.py", line 62, in add_info
Mar 13 22:26:28 ubuntu ubiquity: if cd_error:
Mar 13 22:26:28 ubuntu ubiquity: UnboundLocalError: local variable 'cd_error' referenced before assignment
Mar 13 22:29:08 ubuntu ubiquity: sudo:
Mar 13 22:29:08 ubuntu ubiquity: gnome-open: command not found
Mar 13 22:29:13 ubuntu ubiquity:
Mar 13 22:29:13 ubuntu ubiquity: (firefox:3782): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
Mar 13 22:29:13 ubuntu ubiquity:
Mar 13 22:29:13 ubuntu ubiquity: (firefox:3782): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
Mar 13 22:29:13 ubuntu ubiquity:
Mar 13 22:29:13 ubuntu ubiquity: (firefox:3782): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
Mar 13 22:29:13 ubuntu ubiquity:
Mar 13 22:29:13 ubuntu ubiquity: (firefox:3782): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
Mar 13 22:29:15 ubuntu ubiquity:
Mar 13 22:29:15 ubuntu ubiquity: (firefox:3782): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
Mar 13 22:29:15 ubuntu ubiquity:
Mar 13 22:29:15 ubuntu ubiquity: (firefox:3782): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
Mar 13 22:29:15 ubuntu ubiquity:
Mar 13 22:29:15 ubuntu ubiquity: (firefox:3782): Gtk-WARNING **: Unable to locate theme engine in module_path: "pixmap",
Mar 13 22:29:15 ubuntu ubiquity:
Mar 13 22:29:15 ubuntu ubiquity: (firefox:...