That is due to missing package indicator-sound. Latest version from PPA will quit showing an error dialog instead of crashing straightaway.
Most parts of the application disable themselves if they can not find the required schema and allow the rest to start up, but there are some problematic ones such as this that demand a good deal of work to set straight. As a temporary solution, I've prevented the application from crashing by showing an error dialog at startup instead. status fix-committed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1229791 Title: unity-tweak-tool doesn't start To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity-tweak-tool/+bug/1229791/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
