"sudo ifup wlan0" shows "unknown interface wlan0"
In the desktop, the internet connectivity logo, ethernet works fine but shows "no wireless device detected.
I installed the April 2018 raspbian stretch properly and still doesn't work.
If there is a solution, please let me know.
Or the product might have been damaged before it came to me.
"ifconfig" shows "eth0", "lo" as well as "wlan0" .
So, there might be a solution.
Try running "ifconfig" to see
a) if the interfaces exist
b) What they are called.
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Hi, I had some similar problems a while ago on a fresh raspbian install I think what sorted it for me in the end was the Wi-Fi localisation options in raspi-config, when I looked I'd set the timezone options but now you get separate options for setting your Wi-Fi country. Might not do a lot but if I remember rightly it did help with the issues I was having at the time.
sudo ip link set wlan0 down
sudo ip link set wlan0 up
Thank you, that worked for me while ifup did not.
Pi ZeroW was connected to ESP-01s module access point. For some reason the connection dropped and "ip link show" showed wlan0 in DORMANT state. First I tried only your 2nd command, that did not help. But running both did work!