How to set up WIFI on Ubuntu running on the Raspberry PI 4

First step is to check the status of the interfaces. For this, we will use the net-tools package.

sudo apt install net-tools

Then, we can see the interfaces status

ifconfig -a

In my case, I have this status of my interface wlan0:

ubuntu@ubuntu:~$ ifconfig -a wlan0
wlan0: flags=4098<BROADCAST,MULTICAST> mtu 1500
        ether dc:a6:32:6c:xx:xx txqueuelen 1000 (Ethernet)
        RX packets 0 bytes 0 (0.0 B)
        RX errors 0 dropped 0 overruns 0 frame 0
        TX packets 0 bytes 0 (0.0 B)
        TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

In the flags only there are 2 (BROADCAST,MULTICAST), but there is no “UP” flag.

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