update-manager crashed with TypeError: pulse() takes exactly 1 argument (2 given)

Crashed when I started the upgrade from 12.04 to 14.04. That's not very reassuring.

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: update-manager 1:0.156.14.16
ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Sat Jul 26 09:59:12 2014
DuplicateSignature: TypeError: pulse() takes exactly 1 argument (2 given)
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/update-manager
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
InterpreterPath: /usr/bin/python2.7
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/update-manager -d
ProcEnviron:
 TERM=xterm
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_AU.UTF-8
 LANGUAGE=en_AU:en
PythonArgs: ['/usr/bin/update-manager', '-d']
SourcePackage: update-manager
Title: update-manager crashed with TypeError: pulse() takes exactly 1 argument (2 given)
Traceback: TypeError: pulse() takes exactly 1 argument (2 given)
UpgradeStatus: Upgraded to precise on 2014-07-25 (0 days ago)
UserGroups: adm admin cdrom dialout libvirtd lpadmin plugdev sambashare vboxusers
VarLogDistupgradeAptlog: Log time: 2014-07-26 09:59:33.181824
VarLogDistupgradeTermlog: