grub (Ubuntu) boot menu missing option to go to EFI BIOS

[bilsch01]

Ok. Every thing done: Win partition extended, Ubuntu installed on 45 GiB
partition. I was expecting the new boot menu to have an option to go to
EFI, like my previous boot menu did, but there's no such option now.

I really don't like that.

I would use that option several times a year to boot a linux
thumb drive and then copy a HDD image to an external drive. I rely on
that capability. Booting to Windows and selecting their EFI option is no
good! - what if Windows is broken?

Can anyone tell me how to add EFI option to this new boot menu?

TIA. Bill S.

[David W. Hodgins]

Does the directory /sys/firmware/efi exist? If not, then the efi boot menu
entry is missing because the ubuntu installer was booted using the Compatibility
Support Module (CSM) to emulate a bios only system.

When booting from a device on a usb stick, there are usually two boot menu
entries. One for booting in efi mode, and one for booting in compatibility
mode. The labeling varies depending the the uefi manufacturer and version.

If the install was done in compatibilty mode, it will have to be redone, being
careful to select efi mode, if desired but that is not necessary for booting from
a usb stick.

Which key is used to trigger showing the boot menu varies between firmware
manufacturers. It's using either f8 or f12, but may be something else. The
documentation for that system should indicate which key or key combo is
needed.

Try repeatedly pressing and releasing f8 starting immediately after booting
shows anything on the screen. If it doesn't show the menu, reboot and try
a different function key.

Note that the boot menu will only show the usb device(s) if they have a
bootable usb stick present at boot.

Regards, Dave Hodgins

[bilsch01]

By chance I tried the boot menu option titled:
ADVANCED OPTIONS FOR UBUNTU and from there I selected the option titled:
UBUNTU, WITH LINUX 6.2.0-34-GENERIC (RECOVERY MODE)

That opens a menu that has an option titled: UPDATE GRUB BOOTLOADER. I
clicked that and now the boot menu is corrected i.e. it has the EFI
settings option that it is supposed to have.

[The Natural Philosopher]

Ah , the Ariadne algorithm : try every path until you find the exit from
the maze.
Good for solving really hard sudoku as well...
--
All political activity makes complete sense once the proposition that
all government is basically a self-legalising protection racket, is
fully understood.