update-manager crashed with AttributeError in __init__(): type object 'OSError' has no attribute 'FileNotFoundError'

root@glaptop:> lsb_release -rd
Description: Ubuntu Vivid Vervet (development branch)
Release: 15.04
root@glaptop:> apt-cache policy dpkg
dpkg:
  Installed: 1.17.25ubuntu1
  Candidate: 1.17.25ubuntu1
  Version table:
 *** 1.17.25ubuntu1 0
        500 http://gb.archive.ubuntu.com/ubuntu/ vivid/main amd64 Packages
        100 /var/lib/dpkg/status
root@glaptop:> apt-cache policy sysfsutils
sysfsutils:
  Installed: 2.1.0+repack-4
  Candidate: 2.1.0+repack-4
  Version table:
 *** 2.1.0+repack-4 0
        500 http://gb.archive.ubuntu.com/ubuntu/ vivid/universe amd64 Packages
        100 /var/lib/dpkg/status
root@glaptop:>

ProblemType: Crash
DistroRelease: Ubuntu 15.04
Package: update-manager 1:15.04.3
ProcVersionSignature: Ubuntu 3.13.0-49.81-generic 3.13.11-ckt17
Uname: Linux 3.13.0-49-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.17-0ubuntu2
Aptdaemon:

Architecture: amd64
CurrentDesktop: Unity
Date: Tue Apr 14 13:33:14 2015
ExecutablePath: /usr/bin/update-manager
GsettingsChanges:
 b'com.ubuntu.update-manager' b'show-details' b'true'
 b'com.ubuntu.update-manager' b'window-height' b'401'
 b'com.ubuntu.update-manager' b'first-run' b'false'
 b'com.ubuntu.update-manager' b'window-width' b'395'
 b'com.ubuntu.update-manager' b'launch-time' b'1429014792'
InstallationDate: Installed on 2013-11-29 (500 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
InterpreterPath: /usr/bin/python3.4
PackageArchitecture: all
ProcCmdline: /usr/bin/python3 /usr/bin/update-manager --no-update --no-focus-on-map
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 LANGUAGE=en_GB:en
 XDG_RUNTIME_DIR=<set>
PythonArgs: ['/usr/bin/update-manager', '--no-update', '--no-focus-on-map']
SourcePackage: update-manager
Title: update-manager crashed with AttributeError in __init__(): type object 'OSError' has no attribute 'FileNotFoundError'
UpgradeStatus: Upgraded to vivid on 2014-05-31 (317 days ago)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare sudo vboxusers