And please note if you use 4G version Pi4 board, the usb keyboard doesn't work with the default kernel in the image, to use the usb keyboard, please add total_mem=3072 in the config.txt, then install the proposed kernel, after that you could remove the total_mem=3072 from the config.txt.
@Paulo,
Please download (Raspberry Pi 3 (64-bit ARM) preinstalled server image) from http:// cdimage. ubuntu. com/releases/ eoan/release/
And please note if you use 4G version Pi4 board, the usb keyboard doesn't work with the default kernel in the image, to use the usb keyboard, please add total_mem=3072 in the config.txt, then install the proposed kernel, after that you could remove the total_mem=3072 from the config.txt.
thx.