It’s not clear what method you used but for the benefit of others: Don’t install Ubuntu, it doesn’t have the needed closed source firmware blobs and isn’t compiled with some of the kernel modules the Pi uses. Instead burn a copy of the preinstalled Ubuntu Raspberry Pi disk images to an SD card.

Downloads here: https://ubuntu.com/download/raspberry-pi

64-bit is only supported on newer 3B and 4 devices and is missing some Pi-specific features.