Software center crashes: setting up proxy: 'None'

Please send us the full Terminal output from step 9 in the following procedure:

https://help.ubuntu.com/community/PackageManagerTroubleshootingProcedure

Please post output here:

https://answers.launchpad.net/ubuntu/+question/229974

Then reboot and retest opening Ubuntu Software Center.

tom@tomPC:~$ sudo rm /usr/lib/python*/dist-packages/__pycache__/*pyc
tom@tomPC:~$ sudo apt-get install --reinstall python3-gi
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/204 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 286296 files and directories currently installed.)
Preparing to replace python3-gi 3.8.0-2 (using .../python3-gi_3.8.0-2_amd64.deb) ...
Unpacking replacement python3-gi ...
Setting up python3-gi (3.8.0-2) ...
Processing triggers for libc-bin ...
ldconfig deferred processing now taking place
tom@tomPC:~$ sudo apt-get purge software-center
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages will be REMOVED:
  software-center* ubuntu-desktop*
0 upgraded, 0 newly installed, 2 to remove and 0 not upgraded.
After this operation, 3,647 kB disk space will be freed.
Do you want to continue [Y/n]? y
(Reading database ... 286295 files and directories currently installed.)
Removing ubuntu-desktop ...
Removing software-center ...
Purging configuration files for software-center ...
Processing triggers for man-db ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Processing triggers for hicolor-icon-theme ...
tom@tomPC:~$ rm -rf ~/.cache/software-center
tom@tomPC:~$
tom@tomPC:~$ rm -rf ~/.config/software-center
tom@tomPC:~$
tom@tomPC:~$ rm -rf ~/.cache/update-manager-core
tom@tomPC:~$ sudo rm /var/lib/apt-xapian-index/cataloged_times.p
tom@tomPC:~$
tom@tomPC:~$ sudo rm /var/lib/apt-xapian-index/values
tom@tomPC:~$ sudo update-apt-xapian-index --verbose --force
Reading plugin /usr/share/apt-xapian-index/plugins/aliases.py.
Reading plugin /usr/share/apt-xapian-index/plugins/app-install.py.
Reading plugin /usr/share/apt-xapian-index/plugins/apttags.py.
Reading plugin /usr/share/apt-xapian-index/plugins/cataloged_time.py.
Reading plugin /usr/share/apt-xapian-index/plugins/debtags.py.
Reading plugin /usr/share/apt-xapian-index/plugins/descriptions.py.
Reading plugin /usr/share/apt-xapian-index/plugins/relations.py.
Reading plugin /usr/share/apt-xapian-index/plugins/sections.py.
Reading plugin /usr/share/apt-xapian-index/plugins/sizes.py.
Reading plugin /usr/share/apt-xapian-index/plugins/template.py.
Reading plugin /usr/share/apt-xapian-index/plugins/translated-desc.py.
Most recent dataset: Fri May 31 12:28:23 2013.
Most recent update for: Fri May 31 12:21:31 2013.
Aggregating value information.
Initializing plugins.
Reading .desktop files from /usr/share/app-install/desktop/: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring_main_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-backports_universe_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring_universe_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-updates_main_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_multiverse_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-backports_main_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_universe_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_restricted_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-backports_multiverse_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-updates_universe_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-backports_restricted_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring_restricted_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-updates_restricted_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-updates_multiverse_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring_multiverse_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_main_i18n_Translation-en: done.
Rebuilding Xapian index... 0%
apitrace-gl-frontend:qapitrace.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
apitrace-gl-frontend:qapitrace.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arccert-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arccert-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arcsub-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arcsub-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arcstat-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arcstat-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arcproxy-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arcproxy-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arcstorage-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
arc-gui-clients:arcstorage-ui.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 4%
chinese-calendar:chinese-calendar.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
chinese-calendar:chinese-calendar.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 8%
drumkv1:drumkv1.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
drumkv1:drumkv1.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 10%
expeyes-doc-common:expeyes-doc.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
expeyes-doc-common:expeyes-doc.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
expeyes-doc-common:expeyes-junior-doc.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
expeyes-doc-common:expeyes-junior-doc.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 11%
firewall-applet:firewall-applet.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
firewall-applet:firewall-applet.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
firewall-applet:firewall-config.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
firewall-applet:firewall-config.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 11%
five-or-more:glines.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
five-or-more:glines.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 12%
four-in-a-row:four-in-a-row.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
four-in-a-row:four-in-a-row.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 15%
gnome-calculator:gcalctool.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-calculator:gcalctool.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-klotski:gnome-klotski.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-klotski:gnome-klotski.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-mines:gnome-mines.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-mines:gnome-mines.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-nibbles:gnome-nibbles.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-nibbles:gnome-nibbles.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-robots:gnome-robots.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-robots:gnome-robots.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-tetravex:gnome-tetravex.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
gnome-tetravex:gnome-tetravex.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 19%
ibus-libpinyin:ibus-setup-libbopomofo.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ibus-libpinyin:ibus-setup-libbopomofo.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ibus-libpinyin:ibus-setup-libpinyin.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ibus-libpinyin:ibus-setup-libpinyin.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 20%
indicator-china-weather:indicator-china-weather.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
indicator-china-weather:indicator-china-weather.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 22%
kde-workspace-randr:kde4__krandrtray.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
kde-workspace-randr:kde4__krandrtray.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 23%
ksnakeduel:kde4__kdesnake.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ksnakeduel:kde4__kdesnake.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ksnakeduel:kde4__ktron.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ksnakeduel:kde4__ktron.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 67%
lierolibre:lierolibre.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
lierolibre:lierolibre.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 68%
ltrsift:ltrsift.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ltrsift:ltrsift.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 74%
opera.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
opera.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 77%
plasmate-data:kde4__plasmate.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
plasmate-data:kde4__plasmate.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 77%
polybori-gui:PolyGUI2.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
polybori-gui:PolyGUI2.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
polybori-gui:PolyGUI2.7.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
polybori-gui:PolyGUI2.7.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
polybori-gui:PolyGUI.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
polybori-gui:PolyGUI.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 82%
python-windowmocker:window-mocker.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
python-windowmocker:window-mocker.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 83%
qnifti2dicom:qnifti2dicom.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
qnifti2dicom:qnifti2dicom.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 85%
repsnapper:repsnapper.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
repsnapper:repsnapper.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 90%
sweethome3d-furniture-editor:sweethome3d-furniture-editor.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
sweethome3d-furniture-editor:sweethome3d-furniture-editor.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
sweethome3d-textures-editor:sweethome3d-textures-editor.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
sweethome3d-textures-editor:sweethome3d-textures-editor.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 91%
tali:tali.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
tali:tali.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 94%
ubuntu-ui-toolkit-examples:ubuntu-ui-toolkit-demos.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ubuntu-ui-toolkit-examples:ubuntu-ui-toolkit-demos.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ubuntu-ui-toolkit-examples:ubuntu-ui-toolkit-phone-demo.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ubuntu-ui-toolkit-examples:ubuntu-ui-toolkit-phone-demo.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 94%
ubuntukylin-default-settings:theme-tool.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
ubuntukylin-default-settings:theme-tool.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 94%
unity-tweak-tool:unity-tweak-tool.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
unity-tweak-tool:unity-tweak-tool.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index... 94%
upstart-monitor:upstart-monitor.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
upstart-monitor:upstart-monitor.desktop: parsing X-AppInstall-Popcon: invalid literal for int() with base 10: ''
Rebuilding Xapian index: done.
Installing the new index.
Removing old index /var/cache/apt-xapian-index/index.1.
Writing value information to /var/lib/apt-xapian-index/values.
Writing prefix information to /var/lib/apt-xapian-index/prefixes.
Writing documentation to /var/lib/apt-xapian-index/README.
tom@tomPC:~$ sudo update-apt-xapian-index --force
The index /var/lib/apt-xapian-index is up to date, but rebuilding anyway as requested.
Reading .desktop files from /usr/share/app-install/desktop/: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring_main_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-backports_universe_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring_universe_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-updates_main_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_multiverse_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-backports_main_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_universe_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_restricted_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-backports_multiverse_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-updates_universe_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-backports_restricted_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring_restricted_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-updates_restricted_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring-updates_multiverse_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/nl.archive.ubuntu.com_ubuntu_dists_raring_multiverse_i18n_Translation-en: done.
Reading en translations from /var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_raring-security_main_i18n_Translation-en: done.
Rebuilding Xapian index: done.
tom@tomPC:~$ sudo apt-get update
Hit http://extras.ubuntu.com raring Release.gpg
Hit http://nl.archive.ubuntu.com raring Release.gpg
Hit http://dl.google.com stable Release.gpg
Hit http://nl.archive.ubuntu.com raring-updates Release.gpg
Hit http://extras.ubuntu.com raring Release
Hit http://dl.google.com stable Release.gpg
Hit http://nl.archive.ubuntu.com raring-backports Release.gpg
Hit http://nl.archive.ubuntu.com raring Release
Hit http://extras.ubuntu.com raring/main Sources
Hit http://dl.google.com stable Release
Hit http://deb.opera.com stable Release.gpg
Hit http://nl.archive.ubuntu.com raring-updates Release
Hit http://extras.ubuntu.com raring/main amd64 Packages
Hit http://nl.archive.ubuntu.com raring-backports Release
Hit http://deb.opera.com stable Release
Hit http://nl.archive.ubuntu.com raring/main Sources
Hit http://dl.google.com stable Release
Hit http://security.ubuntu.com raring-security Release.gpg
Hit http://extras.ubuntu.com raring/main i386 Packages
Hit http://nl.archive.ubuntu.com raring/restricted Sources
Hit http://nl.archive.ubuntu.com raring/universe Sources
Hit http://dl.google.com stable/main amd64 Packages
Hit http://deb.opera.com stable/non-free amd64 Packages
Hit http://nl.archive.ubuntu.com raring/multiverse Sources
Hit http://nl.archive.ubuntu.com raring/main amd64 Packages
Hit http://dl.google.com stable/main i386 Packages
Hit http://deb.opera.com stable/non-free i386 Packages
Hit http://nl.archive.ubuntu.com raring/restricted amd64 Packages
Hit http://nl.archive.ubuntu.com raring/universe amd64 Packages
Hit http://security.ubuntu.com raring-security Release
Hit http://nl.archive.ubuntu.com raring/multiverse amd64 Packages
Hit http://nl.archive.ubuntu.com raring/main i386 Packages
Hit http://nl.archive.ubuntu.com raring/restricted i386 Packages
Hit http://dl.google.com stable/main amd64 Packages
Hit http://dl.google.com stable/main i386 Packages
Ign http://extras.ubuntu.com raring/main Translation-en_US
Ign http://extras.ubuntu.com raring/main Translation-en
Hit http://nl.archive.ubuntu.com raring/universe i386 Packages
Hit http://nl.archive.ubuntu.com raring/multiverse i386 Packages
Hit http://security.ubuntu.com raring-security/main Sources
Hit http://nl.archive.ubuntu.com raring/main Translation-en
Hit http://nl.archive.ubuntu.com raring/multiverse Translation-en
Hit http://nl.archive.ubuntu.com raring/restricted Translation-en
Hit http://nl.archive.ubuntu.com raring/universe Translation-en
Hit http://security.ubuntu.com raring-security/restricted Sources
Hit http://nl.archive.ubuntu.com raring-updates/main Sources
Hit http://nl.archive.ubuntu.com raring-updates/restricted Sources
Hit http://nl.archive.ubuntu.com raring-updates/universe Sources
Hit http://nl.archive.ubuntu.com raring-updates/multiverse Sources
Hit http://nl.archive.ubuntu.com raring-updates/main amd64 Packages
Hit http://security.ubuntu.com raring-security/universe Sources
Hit http://nl.archive.ubuntu.com raring-updates/restricted amd64 Packages
Hit http://nl.archive.ubuntu.com raring-updates/universe amd64 Packages
Hit http://nl.archive.ubuntu.com raring-updates/multiverse amd64 Packages
Hit http://nl.archive.ubuntu.com raring-updates/main i386 Packages
Hit http://nl.archive.ubuntu.com raring-updates/restricted i386 Packages
Hit http://security.ubuntu.com raring-security/multiverse Sources
Hit http://nl.archive.ubuntu.com raring-updates/universe i386 Packages
Hit http://nl.archive.ubuntu.com raring-updates/multiverse i386 Packages
Ign http://dl.google.com stable/main Translation-en_US
Hit http://nl.archive.ubuntu.com raring-updates/main Translation-en
Ign http://dl.google.com stable/main Translation-en
Ign http://deb.opera.com stable/non-free Translation-en_US
Hit http://nl.archive.ubuntu.com raring-updates/multiverse Translation-en
Ign http://dl.google.com stable/main Translation-en_US
Ign http://deb.opera.com stable/non-free Translation-en
Ign http://dl.google.com stable/main Translation-en
Hit http://security.ubuntu.com raring-security/main amd64 Packages
Hit http://nl.archive.ubuntu.com raring-updates/restricted Translation-en
Hit http://nl.archive.ubuntu.com raring-updates/universe Translation-en
Hit http://nl.archive.ubuntu.com raring-backports/main Sources
Hit http://nl.archive.ubuntu.com raring-backports/restricted Sources
Hit http://nl.archive.ubuntu.com raring-backports/universe Sources
Hit http://nl.archive.ubuntu.com raring-backports/multiverse Sources
Hit http://nl.archive.ubuntu.com raring-backports/main amd64 Packages
Hit http://security.ubuntu.com raring-security/restricted amd64 Packages
Hit http://security.ubuntu.com raring-security/universe amd64 Packages
Hit http://nl.archive.ubuntu.com raring-backports/restricted amd64 Packages
Hit http://nl.archive.ubuntu.com raring-backports/universe amd64 Packages
Hit http://nl.archive.ubuntu.com raring-backports/multiverse amd64 Packages
Hit http://nl.archive.ubuntu.com raring-backports/main i386 Packages
Hit http://nl.archive.ubuntu.com raring-backports/restricted i386 Packages
Hit http://nl.archive.ubuntu.com raring-backports/universe i386 Packages
Hit http://nl.archive.ubuntu.com raring-backports/multiverse i386 Packages
Hit http://security.ubuntu.com raring-security/multiverse amd64 Packages
Hit http://nl.archive.ubuntu.com raring-backports/main Translation-en
Hit http://nl.archive.ubuntu.com raring-backports/multiverse Translation-en
Hit http://nl.archive.ubuntu.com raring-backports/restricted Translation-en
Hit http://nl.archive.ubuntu.com raring-backports/universe Translation-en
Hit http://security.ubuntu.com raring-security/main i386 Packages
Hit http://security.ubuntu.com raring-security/restricted i386 Packages
Hit http://security.ubuntu.com raring-security/universe i386 Packages
Hit http://security.ubuntu.com raring-security/multiverse i386 Packages
Hit http://security.ubuntu.com raring-security/main Translation-en
Ign http://nl.archive.ubuntu.com raring/main Translation-en_US
Ign http://nl.archive.ubuntu.com raring/multiverse Translation-en_US
Ign http://nl.archive.ubuntu.com raring/restricted Translation-en_US
Ign http://nl.archive.ubuntu.com raring/universe Translation-en_US
Ign http://nl.archive.ubuntu.com raring-updates/main Translation-en_US
Ign http://nl.archive.ubuntu.com raring-updates/multiverse Translation-en_US
Ign http://nl.archive.ubuntu.com raring-updates/restricted Translation-en_US
Ign http://nl.archive.ubuntu.com raring-updates/universe Translation-en_US
Hit http://security.ubuntu.com raring-security/multiverse Translation-en
Ign http://nl.archive.ubuntu.com raring-backports/main Translation-en_US
Ign http://nl.archive.ubuntu.com raring-backports/multiverse Translation-en_US
Ign http://nl.archive.ubuntu.com raring-backports/restricted Translation-en_US
Ign http://nl.archive.ubuntu.com raring-backports/universe Translation-en_US
Hit http://security.ubuntu.com raring-security/restricted Translation-en
Hit http://security.ubuntu.com raring-security/universe Translation-en
Ign http://security.ubuntu.com raring-security/main Translation-en_US
Ign http://security.ubuntu.com raring-security/multiverse Translation-en_US
Ign http://security.ubuntu.com raring-security/restricted Translation-en_US
Ign http://security.ubuntu.com raring-security/universe Translation-en_US
Reading package lists... Done
tom@tomPC:~$ sudo apt-get dist-upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating upgrade... Done
0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
tom@tomPC:~$ sudo apt-get install software-center ubuntu-desktop
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:
  software-center ubuntu-desktop
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 0 B/447 kB of archives.
After this operation, 3,647 kB of additional disk space will be used.
Selecting previously unselected package software-center.
(Reading database ... 285828 files and directories currently installed.)
Unpacking software-center (from .../software-center_5.6.0-0ubuntu2_all.deb) ...
Selecting previously unselected package ubuntu-desktop.
Unpacking ubuntu-desktop (from .../ubuntu-desktop_1.299_amd64.deb) ...
Processing triggers for hicolor-icon-theme ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Processing triggers for man-db ...
Setting up software-center (5.6.0-0ubuntu2) ...
Updating software catalog...this may take a moment.
INFO:softwarecenter.db.pkginfo_impl.aptcache:aptcache.open()
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/workrave:workrave.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser-layer.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
Software catalog update was successful.
Setting up ubuntu-desktop (1.299) ...
tom@tomPC:~$ sudo dpkg-reconfigure software-center --force
Updating software catalog...this may take a moment.
INFO:softwarecenter.db.pkginfo_impl.aptcache:aptcache.open()
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/workrave:workrave.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser-layer.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
Software catalog update was successful.
tom@tomPC:~$ sudo update-software-center
Updating software catalog...this may take a moment.
INFO:softwarecenter.db.pkginfo_impl.aptcache:aptcache.open()
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/workrave:workrave.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser-layer.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
Software catalog update was successful.
tom@tomPC:~$ sudo apt-get install --reinstall software-center
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 0 not upgraded.
Need to get 0 B/443 kB of archives.
After this operation, 0 B of additional disk space will be used.
(Reading database ... 286296 files and directories currently installed.)
Preparing to replace software-center 5.6.0-0ubuntu2 (using .../software-center_5.6.0-0ubuntu2_all.deb) ...
Unpacking replacement software-center ...
Processing triggers for hicolor-icon-theme ...
Processing triggers for bamfdaemon ...
Rebuilding /usr/share/applications/bamf-2.index...
Processing triggers for desktop-file-utils ...
Processing triggers for gnome-menus ...
Processing triggers for man-db ...
Setting up software-center (5.6.0-0ubuntu2) ...
Updating software catalog...this may take a moment.
INFO:softwarecenter.db.pkginfo_impl.aptcache:aptcache.open()
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/workrave:workrave.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser-layer.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser.desktop' could not be read correctly. The application associated with this file will not be included in the software catalog. Please consider raising a bug report for this issue with the maintainer of that application
Software catalog update was successful.

OK, is the Software Center working now?

Can you please execute the last step I gave you in post #1?

"Then reboot and retest opening Ubuntu Software Center."

Yes I did that and the result is the same:

tom@tomPC:~$ software-center
2013-05-31 13:38:17,985 - softwarecenter.ui.gtk3.app - INFO - setting up proxy 'None'
2013-05-31 13:38:18,169 - softwarecenter.fixme - WARNING - logs to the root logger: '('/usr/lib/python2.7/dist-packages/dbus/proxies.py', 410, '_introspect_error_handler')'
2013-05-31 13:38:18,169 - dbus.proxies - ERROR - Introspect error on com.ubuntu.sso:/com/ubuntu/sso/credentials: dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/lib/ubuntu-sso-client/ubuntu-sso-login exited with status 1
Traceback (most recent call last):
  File "/usr/bin/software-center", line 130, in <module>
    app = SoftwareCenterAppGtk3(options, args)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/app.py", line 338, in __init__
    self.icons)
  File "/usr/share/software-center/softwarecenter/ui/gtk3/session/appmanager.py", line 66, in __init__
    self.oauth_token = helper.find_oauth_token_sync()
  File "/usr/share/software-center/softwarecenter/backend/ubuntusso.py", line 141, in find_oauth_token_sync
    sso.find_credentials()
  File "/usr/share/software-center/softwarecenter/backend/login_impl/login_sso.py", line 75, in find_credentials
    self.proxy.find_credentials(self.appname, self._get_params())
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ChildExited: Process /usr/lib/ubuntu-sso-client/ubuntu-sso-login exited with status 1

Are there any bugs reported regarding:

WARNING:softwarecenter.db.update:The file: '/usr/share/app-install/desktop/sonic-visualiser:x-sonicvisualiser.desktop' could not be read correctly

Problem seems to be linked to the following bugreports:

https://bugs.launchpad.net/ubuntu/+source/dbus-python/+bug/1068680
https://bugs.launchpad.net/ubuntu/+source/software-center/+bug/1085425