WiFi adapter not found issue in Ubuntu 20.04

I was facing "WiFi adapter not found" issue in my Ubuntu 20.04 installation on Sony VAIO laptop. I had followed multiple steps but it did not resolve issue. Following steps are something which helped me.

  1. sudo apt update
  2. sudo apt upgrade
  3. sudo apt update-pciids
  4. sudo install firmware-b43-installer
  5. sudo reboot
  6. sudo install firmware-b43-installer
  7. sudo apt-get update
  8. sudo apt-get upgrade
  9. sudo apt-get install --reinstall bcmwl-kernel-source
  10. sudo reboot

I have tried and executed few of steps multiple times, I'm not aware of the reason but above steps should work. Make sure there is no error displayed in steps above.

This post helped me identify few of the steps.

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