Set up Ubuntu Server without GRUB installation.
Set up Ubuntu Server without GRUB installation.
Grub is necessary only for booting several operating systems. For a single OS, it's not required. You can find more details on the Wikipedia page about GNU GRUB.
Check if the image supports UEFI and your laptop does. Ensure secure boot is active. Load the system into a live setup and list the disk partitions. The boot partition should be GPT. You should also be able to install GRUB manually in the live environment. Note that some entries in the bootloader configuration might need correction; consider a fresh GRUB installation if needed.