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

Hello,

I installed Arduino IDE 1.8.19 on Raspberry Pi (Linux raspberrypi 6.12.20+rpt-rpi-2712 #1 SMP PREEMPT Debian 1:6.12.20-1+rpt1~bpo12+1 (2025-03-19) aarch64 GNU/Linux) using sudo apt install arduino.

Using Boards Manager I installed Arduino megaAVR Boards package.

When I try to compile any sketch for Arduino Uno Wifi rev2 I get the following error:

Warning: platform.txt from core 'Arduino megaAVR Boards' contains deprecated compiler.path={runtime.tools.avr-gcc.path}/bin/, automatically converted to compiler.path=/usr/bin/. Consider upgrading this core.
avr-g++: error: device-specs/specs-atmega4809: No such file or directory
exit status 1
Error compiling for board Arduino Uno WiFi Rev2.

Can you please help solving this problem?

Many thanks.

Start by reproducing the Arduino Uno WiFi Rev2 compilation on the reported Raspberry Pi setup, then inspect the Arduino megaAVR Boards platform.txt entry and the avr-g++ invocation. Check why device-specs/specs-atmega4809 cannot be found and verify the result by compiling a sketch successfully.

Written by the indexing model from the issue text.