ubiquity crashed while installing Ubuntu #2

[iGadget]

My secondary attempt to install Ubuntu Trusty, after the failed first attempt (see bug #1286077) results in the same crash.

This time, I did everything the same way, but did not select 'Download updates while installing' and 'Download 3rd party software'. So I guess that rules out that those options cause this crash.

See bug #1286077 for all other details.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubiquity 2.17.8
ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
Uname: Linux 3.13.0-11-generic x86_64
ApportVersion: 2.13.2-0ubuntu5
Architecture: amd64
CasperVersion: 1.337
Date: Fri Feb 28 12:09:07 2014
InstallCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/ubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash --
LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140224)
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:
Feb 28 11:08:29 ubuntu /plugininstall.py: Traceback (most recent call last):
Feb 28 11:08:29 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 1780, in <module>
Feb 28 11:08:29 ubuntu /plugininstall.py: install.run()
Feb 28 11:08:29 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 78, in wrapper
Feb 28 11:08:29 ubuntu /plugininstall.py: func(self)
Feb 28 11:08:29 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 204, in run
Feb 28 11:08:29 ubuntu /plugininstall.py: self.configure_plugins()
Feb 28 11:08:29 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 580, in configure_plugins
Feb 28 11:08:29 ubuntu /plugininstall.py: self.run_plugin(plugin)
Feb 28 11:08:29 ubuntu /plugininstall.py: File "/usr/share/ubiquity/plugininstall.py", line 554, in run_plugin
Feb 28 11:08:29 ubuntu /plugininstall.py: ret = inst.install(self.target, PluginProgress(self.db))
Feb 28 11:08:29 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/plugins/ubi-ubuntuone.py", line 532, in install
Feb 28 11:08:29 ubuntu /plugininstall.py: self.configure_oauth_token(target)
Feb 28 11:08:29 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/plugins/ubi-ubuntuone.py", line 558, in configure_oauth_token
Feb 28 11:08:29 ubuntu /plugininstall.py: uid = self._get_target_uid(target, target_user)
Feb 28 11:08:29 ubuntu /plugininstall.py: File "/usr/lib/ubiquity/plugins/ubi-ubuntuone.py", line 539, in _get_target_uid
Feb 28 11:08:29 ubuntu /plugininstall.py: uid = int(p.communicate()[0].strip('\n'))
Feb 28 11:08:29 ubuntu /plugininstall.py: ValueError: invalid literal for int() with base 10: ''
Feb 28 11:08:29 ubuntu /plugininstall.py: