Ambiance is a GTK2 theme, and hence we are forced to set the default GTK3 theme to Adwaita for now.
As for the fix to the dependency conflicts in the other comments here, the fix is simple: Remove gnome-accessibility-themes and install gnome- themes-standard, gnome-icon-theme and gnome-icon-theme-symbolic. ** Changed in: gsettings-desktop-schemas (Ubuntu) Status: Fix Released => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/734563 Title: [gnome3] Upgrading to Gnome3 PPA breaks Ubuntu theme defaults -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs