loopback mount the ISO and copy its contents onto an EXT4 formatted disk before running a script from inside the USB to make it bootable. The Porteus boot menu offers some interesting options.

If your Hard drive does not show up on the boot menu in Windows 11/10 ... Update or reinstall disk drive drivers Check cable and USB port connection Initialize disk drive Update BIOS Turn on ...

Now that you have created your bootable USB drive, you can boot into Ubuntu. When the computer boots from the flash drive, ...