I'm not sure I've ever gotten a linux distro to boot and install properly from a usb stick using various usb boot install creation tools like unetbootin or ubuntu's. There is a reason I keep a 15 year old purchased stack of DVD-R's around and a 10 year old asus usb cdrom. I'm not sure if anyone's really fixed the automagical tools, and I've tired from wasting my time trying. Every few years I need to cold boot a system like that, I just burn a cd, use one, and then make a beer coaster of it, assuredly polluting the land/oceans at some point.
It's always been a sorely disappointing experience for me at least. There's not a lot in theory you can screwup, so not sure what the heck I'm doing that I'm the only one it doesn't work for, but they simply never work as built, and I've troubleshot to find it's not just me. Arch's bootloader wouldn't work unless the setup tool set the right disk label on the usb drive, which it didn't/couldn't. Ubuntu just never worked at all, but probably more ubuntu installer was atrocious last time I tried it too.
Same reason I kept a usb floppy around for most of the 2000's... CD/Floppy was the only thing reliable to boot any system.
-mb