Ubuntu booted from a live USB.. but why wouldn't it? LibreELEC also works from a live USB but why would want it on some slow and clunky external drive hogging up a USB slot instead of my fast and internal NVMe? I want to put LibreELEC there.
I have no idea how you do any of that since you didn't really give any instructions and ChatGPT keeps malfunctioning so I'm not sure what I'm supposed to be doing.
You might throw insults at some things. Throwing insults at people normally does not help in getting answers.
Ubuntu live CD/USB allows you to install OS on disk and verify that your laptop can boot generic Linux OS.
People are trying to understand your setup while trying to guess what hardware you are using with you giving as little as possible.
Secure boot tends to work with Windows, but it is highly likely to break with Linux. Keep it off with Linux.
MSI GF63/75 manuals show that they support both UEFI and Legacy boots. Change to legacy boot. Make sure that you have nvme and ssd devices listed in boot device list. Both laptops have manual page telling how to change boot mode. If your model is different, BIOS options tend to be similar for several hardware generations.
ChatGPT can't replace your own problem debugging skills. Software still needs human finding the right solution in its data set.