ubiquity crashed with AssertionError in edit_partition()

[Elfy]

Boot daily - on first try to erase whole disk get bug 1352252

let that fail, partitioner refreshes - choose something else - get apport report that ubiquity crashed - installer window still open, close browser - installer shuts down

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: ubiquity 2.19.1
ProcVersionSignature: Ubuntu 3.16.0-6.11-generic 3.16.0-rc7
Uname: Linux 3.16.0-6-generic x86_64
ApportVersion: 2.14.5-0ubuntu3
Architecture: amd64
CasperVersion: 1.341
CrashCounter: 1
Date: Wed Aug 6 20:18:34 2014
ExecutablePath: /usr/lib/ubiquity/bin/ubiquity
InstallCmdLine: file=/cdrom/preseed/xubuntu.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
InterpreterPath: /usr/bin/python3.4
LiveMediaBuild: Xubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140806)
ProcCmdline: /usr/bin/python3 /usr/lib/ubiquity/bin/ubiquity gtk_ui
ProcEnviron: Error: [Errno 13] Permission denied: '/proc/12878/environ'
PythonArgs: ['/usr/lib/ubiquity/bin/ubiquity', 'gtk_ui']
SourcePackage: ubiquity
Title: ubiquity crashed with AssertionError in edit_partition()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Marcus Tomlinson (marcustomlinson)]

This release of Ubuntu is no longer receiving maintenance updates. If this is still an issue on a maintained version of Ubuntu please let us know.

[Launchpad Janitor (janitor)]

[Expired for ubiquity (Ubuntu) because there has been no activity for 60 days.]