Ubuntu For Raspberry Pi 4 8gb ((install)) -

Select the 64-bit Architecture: Always choose the 64-bit version for the 8GB model. It allows the system to address all 8GB of RAM effectively in a single process.

Edit /boot/firmware/config.txt :

20.04 LTS – outdated kernel & poor Pi 4 support. ubuntu for raspberry pi 4 8gb

The 8GB RAM variant removes the memory bottleneck common on 2GB/4GB Pis. Ubuntu (especially the version) can fully use all 8GB, making it ideal for: Select the 64-bit Architecture: Always choose the 64-bit