Permanently disable wlan0 on raspberrypi running ubuntu 20

wireless networking 20.04 raspberrypi

Ubuntu 20 seems to manage networking devices differently. All instructions on disabling wlan0 are tailored to Ubuntu 19 and earlier. I tried blacklisting 'wlan0' in modprobe.d, didn't work.


Following the same principle and dogma (everything changes, "panta rhei") as in the previous comment, please do the following on a raspberry pi 4, having Ubuntu 20.04 LTS.

Add these two lines in the file /boot/firmware/usercfg.txt and never edit the "config.txt".

dtoverlay=disable-wifi
dtoverlay=disable-bt

Figured it out! Edit /boot/firmware/usercfg.txt. add in 

dtoverlay=disable-wifi

.save and reboot

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