我需要启用滚动锁定，以便我可以切换键盘上的灯。这适用于 Arch.Funny 的东西，它不适用于 Ubuntu。
http://linuxtechie.wordpress.com/2008/04/07/getting-scroll-lock-to-work-in-ubuntu/
$ xmodmap -e ‘add mod3 = Scroll_Lock’
xmodmap: unknown command on line commandline:1
xmodmap: unable to open file 'mod3' for reading
xmodmap: unable to open file '=' for reading
xmodmap: unable to open file 'Scroll_Lock’' for reading
xmodmap: 4 errors encountered, aborting.