Booting Ubuntu on a UEFI computer

[Tom H]

On Sun, Feb 18, 2018 at 5:41 PM, Bob <ubuntu-qygzanxc at listemail.net> wrote:
>
> I have purchased a new computer, it is my first UEFI coomputer so I am new to
> this.
>
> I downloaded Ubuntu 17.10.1 ISO to install on an ASUS model X541S. I disabled
> secure-boot and fast-boot and enabled CSM. On the first try I did not allocate
> the bios_gurb partition and could not install. On the second try I allocated
> the bios_grub partition and the install completed.
>
> Ubuntu will not boot.
>
> I did some google searches and found that you need a few files in the /efi/boot
> directory which I can not find anywhere. Does the bios_grub partition have
> those files? I have not found a way to display what is in that partition.

Why did you enable CSM? I've installed Ubuntu (with and without
disabling secure boot) on EFI laptops and servers using "regular" EFI.
In this case you need a FAT filesystem (mounted at "/boot/efi" by
default) containing a boot manager or boot loader (or even a Linux
kernel) that the EFI firmware can load.