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My pi is running in my shed, quite a distance away from my house. It's working but I thought I would try and improve its wifi signal by purchasing a high-gain wireless adapter. I'm having a nightmare trying to install it though.

The output of usb-devices is the following:

T:  Bus=01 Lev=02 Prnt=02 Port=01 Cnt=01 Dev#=  3 Spd=480 MxCh= 0
D:  Ver= 2.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=2357 ProdID=0120 Rev=02.00
S:  Manufacturer=Realtek
S:  Product=802.11ac WLAN Adapter
S:  SerialNumber=00e04c000001
C:  #Ifs= 1 Cfg#= 1 Atr=e0 MxPwr=500mA
I:  If#=0x0 Alt= 0 #EPs= 6 Cls=ff(vend.) Sub=ff Prot=ff Driver=(none)

So it's appeared to have found the device and can identify it, but it's not appearing in ifconfig. I just get eth0, lo and wlan0.

Output of journalctl -b:

Aug 20 11:17:33 enchantedtikished kernel: usb 1-1.2: new high-speed USB device number 3 using xhci_hcd
Aug 20 11:17:33 enchantedtikished kernel: usb 1-1.2: New USB device found, idVendor=2357, idProduct=0120, bcdDevice= 2.00
Aug 20 11:17:33 enchantedtikished kernel: usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
Aug 20 11:17:33 enchantedtikished kernel: usb 1-1.2: Product: 802.11ac WLAN Adapter
Aug 20 11:17:33 enchantedtikished kernel: usb 1-1.2: Manufacturer: Realtek
Aug 20 11:17:33 enchantedtikished kernel: usb 1-1.2: SerialNumber: 00e04c000001

There are two things I am having trouble with:

  1. Getting the adapter to appear as wlan1
  2. Once it appears telling the pi to use wlan1 over the default wlan0

I'm running Raspbian 10 (buster).

Things I've tried

  • Spent a long time trying to compile the driver, but since usb-devices shows its there I shouldn't have to do that should i?
  • Tried editing the /etc/network/interfaces to whats outlined here USB WiFi adapter being detected but no connection - didn't work.
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  • Try ip -br link. Do you find wlan1, maybe DOWN?
    – Ingo
    Commented Aug 20, 2020 at 8:37
  • Thanks @Ingo there is no wlan1.
    – dtsn
    Commented Aug 20, 2020 at 9:47
  • You wrote about default wlan2. What's that? Default is wlan0 for the built-in wifi device. For my understanding with usb-devices you only see the raw usb device that can be supported by a driver, so you have to load the correct driver. Look at journalctl -b if you find something about firmware or driver or realtek.
    – Ingo
    Commented Aug 20, 2020 at 11:02
  • @Ingo sorry that was a typo. Using wlan1 (when I get it to register) over wlan0. I've updated the post with details journalctl -b
    – dtsn
    Commented Aug 20, 2020 at 12:39
  • You have to install the driver. Does this answer your question? Install drivers for RTL8812au wireless usb adapter. Have also a look at How do I install the drivers for a WiFi dongle with the RealTek 8812AU chipset on Raspbian?.
    – Ingo
    Commented Aug 20, 2020 at 16:20

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