Enable Sudo

Install sudo and grant yourself sudo privileges. 

To do these, you must know the root password.

Login as superuser.

$ su -l

The next two commands will install sudo, if it is not already installed.

# apt update

# apt install sudo

With sudo installed, the following enables you to use sudo.

Just replace user-name by your own user name.

# adduser user-name sudo

Log out of the root account and close the Terminal window.

# exit

$ exit

Close any open apps.

In order to activate sudo for your user name, Restart your Computer.

List available Wifi from the command line

nmcli -f SSID dev wifi | sort | uniq | grep -v -- --