As Cimi pointed out it seems to be a packaging bug as the theme modules weren't being loaded. I've fixed that by adding back debian/patches/061_multiarch_module_fallback.patch as the theme packages don't have the modules in a versioned library directory. However GTK+ now crashes when loading the modules, so more investigation required.
** Changed in: light-themes (Ubuntu) Status: Confirmed => Invalid ** Changed in: gtk+3.0 (Ubuntu) Status: Fix Committed => In Progress ** Changed in: gtk+3.0 (Ubuntu) Assignee: (unassigned) => Robert Ancell (robert-ancell) -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gtk+3.0 in Ubuntu. https://bugs.launchpad.net/bugs/1000545 Title: Update to 3.5.2 Status in “gtk+3.0” package in Ubuntu: In Progress Status in “light-themes” package in Ubuntu: Invalid Bug description: Branch ready in lp:~ubuntu-desktop/gtk/ubuntugtk3 but light-themes doesn't work well with it To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk+3.0/+bug/1000545/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp