Cannot access software sources

[Andrew Newton]

software sources will not load.

ProblemType: Crash
DistroRelease: Ubuntu 12.10
Package: nautilus 1:3.5.4-0ubuntu1
ProcVersionSignature: Ubuntu 3.5.0-5.5-generic 3.5.0-rc7
Uname: Linux 3.5.0-5-generic i686
ApportVersion: 2.4-0ubuntu3
Architecture: i386
Date: Fri Jul 20 14:59:40 2012
ExecutablePath: /usr/bin/nautilus
GsettingsChanges:

InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Alpha i386 (20120720.1)
ProcCmdline: nautilus -n
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: nautilus
StacktraceTop:
 raise () from /lib/i386-linux-gnu/libc.so.6
 abort () from /lib/i386-linux-gnu/libc.so.6
 g_assertion_message () from /lib/i386-linux-gnu/libglib-2.0.so.0
 g_assertion_message_expr () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ?? ()
Title: nautilus crashed with SIGABRT in raise()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[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 #1026537, 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.