You can find supported devices here : https://devices.ubuntu-touch.io/
Sadly for you, A30 os not one of those.
There's an update to Focal 20.04, and a code repository here: https://github.com/Exynos7880-Linux/samsung-exynos7880/
I just flashed it and works, didn't test much hardware yet.
@supervisor @Moem m is right I have never tried to make a port it's not easy have a look here https://t.me/UTFAQ/5 and https://t.me/UTFAQ/6
In fact the whole Frequently Asked Questions section is very informative for all sorts of info.