Booting Ubuntu on a UEFI computer

[Bret Busby]

On 19/02/2018, Tom H <tomh0665 at gmail.com> wrote:
> On Sun, Feb 18, 2018 at 11:06 PM, Bret Busby <bret.busby at gmail.com> wrote:
>> On 19/02/2018, 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.
>>
>> This is not an answer to the question posted, but, a question of a
>> solution.
>>
>> Is a HOWTO published for installing Ubuntu on a UEFI/GPT system, now
>> that Ubuntu can apparently be installed directly into the UEFI/GPT
>> system without being concerned about LegacyBIOS?
>
> Ubuntu's been able to install out of the box on EFI boards for a long time.
>
> There's nothing special to be done for EFI. You boot from an
> installation image and
>
> https://tutorials.ubuntu.com/tutorial/tutorial-install-ubuntu-desktop#0
>

I can't acccess that URL.

In the last message before your one above, was

"
> Here is where I think you are getting into trouble.  For Ubuntu
> installer to properly configure EFI boot, you have to boot the install
> CD with EFI.  With CSM enabled, your motherboard will allow you to boot
> the CDROM in legacy mode, in which case, the installer will not load the
> kernel modules needed to install EFI boot environment.  I have even seen
> many motherboards that boot CDROM in legacy mode by default.

That was the problem.  With CSM enabled the first item in the boot menu was the
CD in legacy mode.  The CD in EFI mode was the fourth entry.  This required me
to hold the Esc key when I power on to get the boot menu and select the EFI CD
to install Ubuntu.


> When your system is booting, there should be a way to choose a one time
> boot media.  In your choices, you should see for an option that
> explicitly offers UEFI on the CDROM.  If it's too obscure, you can try
> just disabling the CSM, (and therefore, no legacy boot whatsoever.)
"

(although I do not know what is CSM in this context - I know the
acronym as a WO2 - a Company Sergeant Major)

which message text, shows that a boot sequence may need to be
disrupted, to obtain a UEFI installation.

-- 
Bret Busby
Armadale
West Australia

..............

"So once you do know what the question actually is,
 you'll know what the answer means."
- Deep Thought,
 Chapter 28 of Book 1 of
 "The Hitchhiker's Guide to the Galaxy:
 A Trilogy In Four Parts",
 written by Douglas Adams,
 published by Pan Books, 1992
....................................................