You can already do this in Ubuntu. Just start with a mini iso (e.g. http://ports.ubuntu.com/ubuntu-ports/dists/xenial-updates/main/installer-arm64/current/images/hwe-netboot/ ). It’s a bit more involved than a normal Raspberry Pi installation as there are a few manual bits, but it is very much do-able. Some brief info is on the wiki https://wiki.ubuntu.com/ARM/RaspberryPi#Ubuntu_arm64.2FAArch64 . It is also possible to have a multi-arch system. Some people have used this to get around the Firefox problems (and this would be a valid reason for pursuing a 64 bit system).
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