Compile Arduino WiFi Rev2 issue with Linux

Official Hardware UNO Family UNO WiFi Rev2
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I'm having issues compiling code for the Wifi Rev 2 board.

I had no issues using win10 but now I'm trying to use linux (Ubuntu 22.04.1 LTS) and it won't compile.

Error shown is: avr-g++: error: device-specs/specs-atmega4809: No such file or directory

I saw this article and tried to follow the steps but having no joy: Can't compile Arduino WiFi Rev2

  1. Arduino IDE will not uninstall
  2. Following the steps for Linux, downloaded the AppImage file and set the permissions but nothing happens when I try to run it.

I've tried using older versions of the MegaAVR pack for the board, rather than the latest version, but still the same issue.

Any other ideas of what to do? I believe there was an issue originally with Linux and WifiRev2 board but according to this thread, it was resolved in 2019: Linux ARM version of avr-gcc 5.4.0-atmel3.6.1-arduino2 doesn't support ATmega4809 · Issue #17 · arduino/ArduinoCore-megaavr · GitHub

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