I suspect you don't know about UEFI vs. MSDOS/Legacy booting types.
Check 1st in your BIOS.
- Is UEFI capable?
- If yes, is it set to UEFI always, or what boot mode?
- In your previous install attempts, have you selected USB UEFI, or just USB drive option.
- Did you try auto install, or manual partitioning?
- Was there an option about "Where to install bootloader"?
- Was their a partition created which was mounted at
To be continued... after your answers.