I didn't find one matching exactly that one with some quick queries on bugzilla but I know that's a known issue for ages now (since acme, which is the code for multimedia keys, has been merged to the shortcuts dialog probably)
-- keyboard shortcut not running gnome-terminal https://launchpad.net/bugs/48255 -- desktop-bugs mailing list desktop-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/desktop-bugs
