I have a USB wifi adapter and I don't seem to make it work. it working before (2 months ago) but now it's not. running lsusb returns the driver:

Bus 001 Device 009: ID 0bda:b812 Realtek Semiconductor Corp. USB3.0 802.11ac 1200M Adapter

I'm not sure if the adapter is broken or I need a new driver and I looked on the internet and couldn't find and suitable driver for it.

Any help is much appreciated. I have already tried the solution here but didn't work. I think it's for some old drivers

  • Ubuntu 20? There is no such release. Ubuntu uses yy.mm format (year.month of release) for all server & desktop releases, the yy being used only for IoT and specialist appliance/devices and cloud use that can use snap packages only. Please clarify which product you are using (year only releases mean a different product since 2016)
    – guiverc
    Jan 30, 2021 at 4:52
  • There are multiple answers there; did you try all of them? What was the result of each?
    – muru
    Jan 31, 2021 at 4:48

1 Answer 1


Possible the wireless driver is not working any more after some updates, you should try to re-compile & re-install the wireless driver



make install

# reboot & check connection

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