Can I use Ubuntu live USB on a MacBook Pro M1? [duplicate]

No, sorry.

M1 is a completely different CPU architecture. It's not an amd64 or other supported architecture

It's not a question of "Linux does not support M1." It's the other way around: Apple does not support Linux on their proprietary M1 hardware platform. It's Apple's decision, not ours.

See also How to install Ubuntu on a Mac with M1 processor? for more details and discussion on the hurdles of trying to reverse-engineer a platform that does not encourage such effort.

There is a project to port Linux to M1. However, that project involves reverse-engineering MacOS and M1. It's haywiring Linux onto hardware that the manufacturer does not provide Linux support for. A great project for a hobby, but perhaps unwise for reliable daily use.