How to make a persistent USB/SD from Mac

Question

I've been searching the internet for ages now and I haven't been able to find a way to make a persistent Ubuntu 20.04 USB from a Mac. All the articles seem to either be outdated or just say "now boot to it" at the end, and when I do, it doesn't work. The closest I've got is using these articles (https://ubuntu.com/tutorials/create-a-usb-stick-on-macos#1-overview and https://www.linuxuprising.com/2019/03/create-persistent-storage-live-usb-with.html)

Using Etcher to make a normal live USB
Booting to it, downloading mkusb and making a live 'persistent' USB
Booting to that USB and getting stuck at the loading page, and when I try recovery mode I get a kernel panic

I have a 2013 MacBook Air, loads of 8GB USB sticks, and a 16 GB SD card. If anyone could help me that would be amazing.

I use the dd CLI command just as I would on any Unix box to flash drives. You don’t really need a GUI tool. — Simon Banks, Mar 29 '21 at 05:15

score 0 · Answer 1 · answered Mar 29 '21 at 04:44

UNetbootin

Has a MacOS version, it can be downloaded here:

Off the shelf persistence is limited to 4GB but it is easy to create a persistent partition of any size, see: Can I convert a live Ubuntu USB to one with persistent memory?