Booting Ubuntu on a UEFI computer

[Bret Busby]

On 20/02/2018, Liam Proven <lproven at gmail.com> wrote:
> On 19 February 2018 at 16:26, Bret Busby <bret.busby at gmail.com> wrote:
>
>> I can't acccess that URL.
>
> Works for me.
>
> Try removing the #0 from end. It will go to the 1st slide automatically
> anyway.
>

 I had also tried that.

I simply got a blank screen. I am using Konqueror for the gmail
account, although I also copied and pasted the URL to a Firefox
window, and got the same failure.

I was able to view another Ubuntu website web page, linked from an
email message in the thread about Meltdown and Spectre (as opposed to
SPECTRE, which is the organisation with which, James Bond had a
problem).

So, I think it is a problem pertaining to the particular web page.

>> (although I do not know what is CSM in this context - I know the
>> acronym as a WO2 - a Company Sergeant Major)
>
> I didn't either. I had to Google it.
>
> Compatibility Support Module[edit]
>
> https://en.wikipedia.org/wiki/Unified_Extensible_Firmware_Interface#CSM
>
>> which message text, shows that a boot sequence may need to be
>> disrupted, to obtain a UEFI installation.
>
> I cannot parse this sentence.
>

The preceding sentence, relating to CSM's, was parenthesied, so that
sentence part, followed, and, related to the message extract that I
had included;
"
>> which message text, shows that a boot sequence may need to be
>> disrupted, to obtain a UEFI installation.
"

Now, to what, that related, is the text that I had quoted;


"
> 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.)
"

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

The boot sequence apparently, was required to be disrupted (according
to the original poster,

"
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.
"
)

thus, requiring the boot sequence to be disrupted, in order for him to
access the UEFI version of the installation, rather that the
LegacyBIOS version of the installation, to which the boot sequence,
apparently, defaulted, in the absence of the boot sequence disruption.


-- 

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

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