ubuntu installer crashes at "installing language packs"

[zub]

A reproducible crash (happened 3 times out of 3 attempts), using 13.04 daily-live/current/raring-desktop-amd64.iso.

The cause seems to be this (from /var/log/syslog):

Mar 11 23:44:44 ubuntu ubiquity: Error in function
Mar 11 23:44:44 ubuntu ubiquity: pulse
Mar 11 23:44:44 ubuntu /plugininstall.py: Exception during installation:
Mar 11 23:44:44 ubuntu /plugininstall.py: Traceback (most recent call last):
Mar 11 23:44:44 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 277, in pulse
Mar 11 23:44:44 ubuntu /plugininstall.py: AcquireProgress.pulse(self, owner)
Mar 11 23:44:44 ubuntu /plugininstall.py: File "/usr/lib/python3/dist-packages/apt/progress/text.py", line 187, in pulse
Mar 11 23:44:44 ubuntu /plugininstall.py: val += ' %sB' % apt_pkg.size_to_str(worker.current_size)
Mar 11 23:44:44 ubuntu /plugininstall.py: UnicodeDecodeError: 'utf-8' codec can't decode byte 0xa0 in position 1: invalid start byte
Mar 11 23:44:44 ubuntu /plugininstall.py:
Mar 11 23:44:44 ubuntu ubiquity: #015Get:1 http://cz.archive.ubuntu.com/ubuntu/ raring/main hyphen-en-us all 2.8.3-2 [54,9 kB]
Mar 11 23:50:52 ubuntu ubiquity:
Mar 11 23:50:52 ubuntu ubiquity: (process:8771): GLib-CRITICAL **: g_slice_set_config: assertion `sys_page_size == 0' failed

Attaching last ~200 lines of /var/log/syslog, not attaching partman as it doesn't seem relevant for this bug - partitioning worked correctly. If needed I can provide more info from the syslog, I just didn't want to include the whole file.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: ubiquity 2.13.13.1
ProcVersionSignature: Ubuntu 3.8.0-12.21-generic 3.8.2
Uname: Linux 3.8.0-12-generic x86_64
ApportVersion: 2.9.1-0ubuntu1
Architecture: amd64
CasperVersion: 1.330
Date: Tue Mar 12 00:49:19 2013
LiveMediaBuild: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64 (20130311.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[zub (zub-linux)]

Forgot to add: it's a clean install.

[zub (zub-linux)]

Still eproducible with today's daily.

Selecting a language other then en_US works as a workaround (I used cs_CZ).

[Launchpad Janitor (janitor)]

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