before insitalling
ALWAYS recheck options in UEFI
secure boot off
fast boot off
csm off
legacy off
drivers on AHCI ( not raid )
no optane RST
it easy to check before installing
inxi -Fxza
test -d /sys/firmware/efi && echo efi || echo bios
sudo efibootmgr -v
sudo parted -l if you get MBR instead of UEFI that you have not checked BEFORE installing