UEFI or Legacy for 2x boot(win10)w/grub

[Stephane]

see theses points

How difficult is it to set up EOS with a dualboot alongside windows?

check all option in your UEFI create 2 profiles if possible one windows with Secureboot other with linux check also Disks for AHCI , and no hibernation from windows SecureBoot off Fast Boot off No CSM No Legacy all disks on AHCI No optane/RST you can check in terminal before installing inxi -Fxza test -d /sys/firmware/efi && echo efi || echo bios sudo parted -l you may need vmd package for nvme