剛裝好的時候在右上角的系統列會有 Wifi/Network 連線狀況的指示圖示，
但是不知道是因為更新還是動到什麼設定，指示圖示消失了
http://i.imgur.com/gOeeVpn.png
上網查了很久，發現應該跟 nm-applet 有關系
~$ nm-applet
nm-applet-Message: using fallback from indicator to GtkStatusIcon
(nm-applet:3979): nm-applet-WARNING **:
Could not find ShellVersion property on org.gnome.Shell after 5 tries
^C
nm-applet-Message: PID 0 (we are 3979) sent signal 2, shutting down...
(nm-applet:3979): GLib-CRITICAL **:
Source ID 178 was not found when attempting to remove it
試了網路上的方法
1.
sudo apt-get purge network-manager-gnome
sudo apt-get install network-manager-gnome
2.
sudo apt-get install