But in ubuntu mate most of times the nm-applet which is showing our network connections and settings (by the way most important applet) is not showing at startup. So we are unable to connect between different network connections same time (LAN , Wi-Fi , Mobile broadband connections.)
To make appear the nm-applet (Network Manager) on the notification area follow the steps.
sudo nano /etc/xdg/autostart/nm-applet.desktop
Remove the following line from this
AutostartCondition=GNOME3 unless-session gnome
and save it.
Then
sudo nano /home/lionel/.config/autostart/nm-applet.desktop
Take a lookat the following line
X-MATE-Autostart-enabled=false
if it's false like this change it to "true"
Now logout and login from your machine.
Check it's ok
If not,
sudo nano /etc/NetworkManager/NetworkManager.conf
Take a look at for the foll lowing line
[ifupdown]
managed=false
if it's false change it to "true"
save it, logout and login.
Check whether now you have the nm-applet.
else install the following
sudo apt-get install indicator-applet-complete