Lubuntu installer crashed

[Nick Martin]

I am installing Lubuntu from a flash drive and the installer crashed.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.10.29
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic i686
ApportVersion: 2.0.1-0ubuntu5
Architecture: i386
CasperVersion: 1.315
Date: Wed Feb 19 12:05:12 2014
InstallCmdLine: file=/cdrom/preseed/lubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --
LiveMediaBuild: Lubuntu 12.04 "Precise Pangolin" - Release i386 (20120423)
ProcEnviron:
 TERM=unknown
 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:
Feb 19 17:04:53 lubuntu plugininstall.py: Traceback (most recent call last):
Feb 19 17:04:53 lubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1730, in <module>
Feb 19 17:04:53 lubuntu plugininstall.py: install.run()
Feb 19 17:04:53 lubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 55, in wrapper
Feb 19 17:04:53 lubuntu plugininstall.py: func(self)
Feb 19 17:04:53 lubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 174, in run
Feb 19 17:04:53 lubuntu plugininstall.py: self.install_language_packs()
Feb 19 17:04:53 lubuntu plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 664, in install_language_packs
Feb 19 17:04:53 lubuntu plugininstall.py: self.do_install(self.langpacks, langpacks=True)
Feb 19 17:04:53 lubuntu plugininstall.py: File "/usr/lib/ubiquity/ubiquity/install_misc.py", line 856, in do_install
Feb 19 17:04:53 lubuntu plugininstall.py: with Cache() as cache:
Feb 19 17:04:53 lubuntu plugininstall.py: AttributeError: __exit__
Feb 19 17:04:53 lubuntu plugininstall.py: