update-manager crashed with SIGABRT in g_assertion_message()

Tried a upgrade in a VM from 14.10 (Utopic) to 15.04 (Vivid), got this crash.

ProblemType: Crash
DistroRelease: Ubuntu 14.10
Package: update-manager 1:14.10.6
ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
Uname: Linux 3.16.0-25-generic i686
ApportVersion: 2.14.7-0ubuntu8
Architecture: i386
Date: Mon Nov 24 21:19:04 2014
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:

InstallationDate: Installed on 2014-09-29 (56 days ago)
InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140723)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/update-manager -d
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=de_DE.UTF-8
 LANGUAGE=de_DE
 SHELL=/bin/bash
Signal: 6
SourcePackage: update-manager
StacktraceTop:
 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
 ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
 g_cclosure_marshal_VOID__VOIDv () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
Title: update-manager crashed with SIGABRT in g_assertion_message()
UpgradeStatus: Upgraded to utopic on 2014-09-29 (56 days ago)
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