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I have the Raspberry Pi 4 Model B and my choice of RAM was the 4GB. i don't have internet via the gigabit ethernet at the moment, all i have is my smartphone to share internet via a hotspot (wifi).

i have installed Ubuntu Server 64-bit on the Raspberry 4 following the instructions on the ubuntu official webpage by flashing Ubuntu onto a 128GB samsung microSD card.

The installation went good, but now i want to connect the Raspberry to the internet via the command line to fetch some packages and install the desktop.

How can i setup the wifi via the command line on the Raspberry 4B 4GBRAM?

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To be able to setup Wifi on Raspberry Pi 4 B+ 4GB on Ubuntu server 18 TLS, you first need to get the name of the wifi card by showing physical components using the following command:

 $ sudo lshw

in my case it was wlan0

Then navigate to /etc/netplan/ using the cd command the hit Enter

$ cd /etc/netplan/

use the command lsto list the files and directories under the folder then you now have to edit the .yaml file:

$ sudo nano 50-cloud-init.yaml

finally add the following lines to the 50-cloud-init file:

wifis:
           wlan0:
                      optional: true
                      access-points:
                                “SSID-NAME”
        Password: “WIFI-PASSORD”
   Dhcp4: true

NOTE: make sure not to use tab for space, use the spacebar to create the blank.

here is the final file code:

# this file generated from information provided by the datasource. Changes
             # to it will not persist across an instance reboot. To disable cloud-init’s
             # network configuration capabilities, write a file 
             # /etc/cloud/cloud.cfg.d/99-disable-network-config-cfg with the following:
             # network:{config: disabled}

    network:
                   ethernets:
                             etho:
                                     dhcp4: true
                                     optional: true
                   version: 2

              # Adding wifi informations

              wifis:
                   wlan0:
                              optional: true
                              access-points:
                                        “SSID-NAME”
                Password: “WIFI-PASSORD”
           Dhcp4: true

Change the SSID-NAMEand the WIFI-PASSORD they have to be in quotes.

Close and save the file using ctrl+x and yes by tipping the letter y

finally you need to do some debugs

$ sudo netplan –debug try 
$ sudo netplan –debug generate 
$ sudo netplan –debug apply 

then reboot the pi

$ sudo reboot

Install ubuntu desktop with the following commad:

$ sudo apt-get install ubuntu-desktop
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https://netplan.io/examples

The above link provides further information on setting up the yaml file for those who have difficulty still.

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