http://askubuntu.com/questions/91445/how-do-i-remove-an-icon-from-the-top-panel-in-gnome-fallback-mode
rt,
win+alt+right button
http://askubuntu.com/questions/91445/how-do-i-remove-an-icon-from-the-top-panel-in-gnome-fallback-mode
rt,
win+alt+right button
转载于:https://my.oschina.net/vdroid/blog/206031