software-properties-gtk crashed with TypeError in set_release_upgrades_policy(): 'str' does not support the buffer interface

[josa]

Opened Software sources in Synaptic and changed notification of new ubuntu version from Long-term support versions to Any new version.
After opening Software sources again it was still set to Long term version. Tried it using Ubuntu software center as well to be sure and get the exact same behavior.

This is a fresh install and I did this after applying all available updates and restarted.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: software-properties-gtk 0.86
ProcVersionSignature: Ubuntu 3.5.0-3.3-generic 3.5.0-rc5
Uname: Linux 3.5.0-3-generic x86_64
ApportVersion: 2.2.5-0ubuntu2
Architecture: amd64
CrashCounter: 1
Date: Sat Jul 7 12:42:11 2012
ExecutablePath: /usr/bin/software-properties-gtk
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120629)
InterpreterPath: /usr/bin/python3.2mu
PackageArchitecture: all
ProcCmdline: /usr/bin/python3.2 /usr/bin/software-properties-gtk -n -t 25165953
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
 PATH=(custom, no user)
PythonArgs: ['/usr/bin/software-properties-gtk', '-n', '-t', '25165953']
SourcePackage: software-properties
Title: software-properties-gtk crashed with TypeError in set_release_upgrades_policy(): 'str' does not support the buffer interface
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make this software better. This particular crash has already been reported and is a duplicate of bug #1021639, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.