Exactly the same issue on my computer. Ubuntu 14.04 x64 Itried the folowing:
gary@deepblue:~|⇒ dpkg -S /usr/share/themes/Adwaita/index.theme dpkg-query: aucun chemin ne correspond à /usr/share/themes/Adwaita/index.theme gary@deepblue:~|⇒ dpkg -S Adwaita dpkg-query: aucun chemin ne correspond à *Adwaita* gary@deepblue:~|⇒ dpkg -S index.theme oxygen-icon-theme: /usr/share/icons/oxygen/index.theme gnome-accessibility-themes: /usr/share/icons/HighContrast/index.theme humanity-icon-theme: /usr/share/icons/Humanity/index.theme hicolor-icon-theme: /usr/share/icons/hicolor/index.theme ubuntu-sounds: /usr/share/sounds/ubuntu/index.theme light-themes: /usr/share/themes/Ambiance/index.theme dmz-cursor-theme: /usr/share/icons/DMZ-White/index.theme unity-webapps-common: /usr/share/icons/unity-webapps-applications/index.theme light-themes: /usr/share/themes/Radiance/index.theme humanity-icon-theme: /usr/share/icons/Humanity-Dark/index.theme ubuntu-mono: /usr/share/icons/ubuntu-mono-light/index.theme gnome-icon-theme: /usr/share/icons/gnome/index.theme ubuntu-mono: /usr/share/icons/LoginIcons/index.theme gnome-accessibility-themes: /usr/share/themes/HighContrast/index.theme dmz-cursor-theme: /usr/share/icons/DMZ-Black/index.theme app-install-data: /usr/share/app-install/index.theme sound-theme-freedesktop: /usr/share/sounds/freedesktop/index.theme unity-asset-pool: /usr/share/icons/unity-icon-theme/index.theme ubuntu-mono: /usr/share/icons/ubuntu-mono-dark/index.theme gary@deepblue:~|⇒ sudo apt-get install --reinstall gnome-accessibility-themes light-themes libgtk-3-common libgtk2.0-common metacity-common [...] Nothing to do... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1323736 Title: Segmentation Fault when Opening Appearance To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity-control-center/+bug/1323736/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs