Raspberry Pi 3B+ and 4 "No wireless interfaces found"

[Blauenfeldt]

I guess I have to do that.
I have used a lot of time compiling and makeing things forward/backwards compatible python wise. Is there a way to save and transfer that?

[Blauenfeldt]

Now that i look this post through, I saw that rfkill says “wlan”. Is it possible, that my Pi looks for wlan0 and not wlan, and therefore not being able to find it?

[sdetweil]

@Blauenfeldt rfkill?

sudo ifconfig
will list the network interfaces

[Blauenfeldt]

I did some digging around the net, and kinda got wifi working again. Wifi itself works fine. I can do sudo iwlist wlan0 scan, and see surrounding wifi. However the drop-down list on the panel does not work.
What i did to get my wifi working to this point was changing the /etc/network/interfaces file to

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

auto wlan0
allow-hotplug wlan0
iface wlan0 inet dhcp
        wpa-conf /etc/wpa_supplicant/wpa_supplicant.conf

I found out I had some spelling errors like .config instead of .conf and found a default Buster Wpa_supplicant.conf file

here is my new Sudo ifconfig

eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.87.198  netmask 255.255.255.0  broadcast 192.168.87.255
        inet6 fe80::dea6:32ff:fe20:55bf  prefixlen 64  scopeid 0x20<link>
        ether dc:a6:32:20:55:bf  txqueuelen 1000  (Ethernet)
        RX packets 1775  bytes 510729 (498.7 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1633  bytes 972722 (949.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 275  bytes 80411 (78.5 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 275  bytes 80411 (78.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.87.199  netmask 255.255.255.0  broadcast 192.168.87.255
        inet6 fe80::dea6:32ff:fe20:55c0  prefixlen 64  scopeid 0x20<link>
        ether dc:a6:32:20:55:c0  txqueuelen 1000  (Ethernet)
        RX packets 20  bytes 2957 (2.8 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 32  bytes 5653 (5.5 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

Everything works, even ethernet, except for the wifi drop-down menu (shown below)

If I hover the mouse over it it says “connection to dhcpcd lost”
If I click on it, it says “No wireless interfaces found”
Can not really find anymore answers to this problem.
Have i disabled something somewhere?

[Blauenfeldt]

@sdetweil

[sdetweil]

@Blauenfeldt no idea. as I said, I don’t use noobs because of all this extra setup I don’t want to learn