Thanks Daniel Serpell. but add the bellow command to resetting the volume-down too:
~$ gsettings reset org.gnome.settings-daemon.plugins.media-keys volume- down -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1302885 Title: Media keyboard shortcuts not working To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity-control-center/+bug/1302885/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
