are you on uefi secure boot off? thats what I use
if you want to boot like this you need to have gtp type partition which I recommend only doing with a formatted drive first.
you copy the also the /efi folder with /boot and /porteus
then add this to custom_40
#this boots directly into porteus
menuentry "Porteus5.01" {
set root=(hd0,1)
search --no-floppy --fs-uuid --set=root 66DD-8703
linux /boot/syslinux/vmlinuz changes=UUID:c012e6fd-3881-4876-bef8-12685e4b1b75/changes12
initrd /boot/syslinux/initrd.xz
}
#this boots to the porteus bootmanager from grub2
menuentry "PorteusBootmanager"{
set root='(hd0,1)'
search --no-floppy --fs-uuid --set=root 66DD-8703
chainloader /efi/boot/bootx64.efi
}
obviously you only want one menu entry so I use
#this boots to the porteus bootmanager from grub2
menuentry "Porteus5.01"{
set root='(hd0,1)'
search --no-floppy --fs-uuid --set=root 66DD-8703
chainloader /efi/boot/bootx64.efi
}
update-grub and it will add the menu entries from custom_40
this is the manual way to do it. see below for using grub customizer.
I do it this way because to have csm on is a pain to switch back to windows (battleeye or anti cheats will end up kicking you) if youre on csm.
for beginners which is what I am I use ubuntu which installs grub2 on my windows drive. so having windows 11 and ubuntu on the same drive.
then inside ubuntu I use grub customize which is a gui
that you can easily change your menu entries, add themes and important set the resoltuion to 1024x768x32.
I use the theme from blaze on the forum
https://www.mediafire.com/file/5h7x9tg9 ... us.tar.bz2
select the tar in add themes and you have your theme installed.
press save and it will update the grub bootloader