wlan0 does not appear in Ubuntu server and raspberry pi 4

I followed the instruction in answer for this post to use Ubuntu server (64 bits) in my raspberry pi 4. It worked well, but I haven't been able to get the wifi interface available. It is, if I do ifconfig -a, only eth0 and lo interfaces are shown. How could I solve this?

1 Answer

I had the same problem with ubuntu 18.04.3 on a 3B+, but user chilli555 posted a link to this:

b43 Wireless Driver Problems in Ubuntu Server 18.04

and it worked for me, except that I had to replace the name of the wlan interface from wlp1s0 to wlan0.

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