If you are attempting to install Ubuntu alone on the disk, the installer will create the first partition as a primary partition. And that first partition, following the recommendation made earlier, should be mounted at /boot. The default file system for /boot on Ubuntu is ext2. How to install ubuntu - https://how2install.org/how-to-install-ubuntu/
#How to install windows 11
Web: https://how2install.org/how-to-install-windows-11/