It's x11proto-core-dev, if you get stuck with that again, you can figure it out by following the link in the call to test the proposed package:
https://launchpad.net/ubuntu/+source/x11proto-core/7.0.22-1ubuntu0.1 -- You received this bug notification because you are a member of Ubuntu Desktop Bugs, which is subscribed to gnome-settings-daemon in Ubuntu. https://bugs.launchpad.net/bugs/408903 Title: Does not handle microphone mute button (KEY_MICMUTE) To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/408903/+subscriptions -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs