After installing Ubuntu under VirtualBox the nm-applet is missing.

I already tried to restart the applet but nothing has happened. Any suggestions?

jonas@jonas-laptop:~$ kill nm-applet 
bash: kill: nm-applet: arguments must be process or job IDs 
jonas@jonas-laptop:~$ kill 2649 
jonas@jonas-laptop:~$ sudo nm-applet 


** (nm-applet:2740): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: The name org.freedesktop.NetworkManager was not provided by any .service files 
** Message: applet now removed from the notification area 

** (nm-applet:2740): WARNING **: Failed to register as an agent: (2) The name org.freedesktop.NetworkManager was not provided by any .service files 
** Message: using fallback from indicator to GtkStatusIcon 

(nm-applet:2740): GdkPixbuf-CRITICAL **: gdk_pixbuf_scale_simple: assertion `dest_width > 0' failed 
** Message: Starting applet secret agent because GNOME Shell disappeared 

** (nm-applet:2740): WARNING **: Failed to register as an agent: (2) The name org.freedesktop.NetworkManager was not provided by any .service files

Thanks for the suggestions .