I deleted 2 ext4 partitions and extended my ntfs (Windows) partition by
additional 98 GiB, which left about 45 GiB space at the end of the SSD.
Next, I installed Ubuntu 22.04.3 at the end of the SSD using the 22.04.3
installer on a thumb drive. This gave me back my boot menu, which had
disappeared when I deleted Ubuntu - good.

The new boot menu has no option to enter EFI setup. I really want that
option on the menu - I really want that. Someone suggested this problem
might be because I booted my Ubuntu 22.04.3 installer in 'compatibility'
mode, instead of EFI mode. They said if Ubuntu does not have the directory
sys.firmware.efi
then I must have booted the installer in compatibility mode. However I
DO have directory
sys.firmware.efi. Furthermore, nowhere do I find an option to choose
"compatibility" or "EFI" when booting the Ubuntu installer.

Can anyone tell me how to add the EFI option to the (grub) boot menu.

TIA. Bill S

On 10/15/2023 3:29 AM, bilsch01 wrote:
> I deleted 2 ext4 partitions and extended my ntfs (Windows) partition by additional 98 GiB, which left about 45 GiB space at the end of the SSD.
> Next, I installed Ubuntu 22.04.3 at the end of the SSD using the 22.04.3 installer on a thumb drive. This gave me back my boot menu, which had disappeared when I deleted Ubuntu - good.
>
> The new boot menu has no option to enter EFI setup. I really want that option on the menu - I really want that. Someone suggested this problem might be because I booted my Ubuntu 22.04.3 installer in 'compatibility' mode, instead of EFI mode. They said if Ubuntu does not have the directory
> sys.firmware.efi
> then I must have booted the installer in compatibility mode. However I DO have directory
> sys.firmware.efi. Furthermore, nowhere do I find an option to choose "compatibility" or "EFI" when booting the Ubuntu installer.
>
> Can anyone tell me how to add the EFI option to the (grub) boot menu.
>
> TIA.   Bill S

https://www.baeldung.com/linux/grub-bootloader-add-new-os

"
$ sudo cat /etc/default/grub | grep 'GRUB_DISABLE_OS_PROBER'
GRUB_DISABLE_OS_PROBER=true

If we get false, then it shows os-prober is active. That example needs to be changed.

# sudo update-grub
"

apt search os-prober

sudo apt install os-prober # If it is not currently installed

That's the kind of material, to make GRUB pick up windows OSes.
Check your os-prober, before doing the update-grub.

[Picture]

https://i.postimg.cc/WzrWxRY7/Boot-Menu-Multiboot-Mix.gif

This is what the update-grub looks like, when I run it there.
This would correspond to the provided [Picture].

bullwinkle@CRUISE:~$ sudo update-grub
Sourcing file `/etc/default/grub'
Sourcing file `/etc/default/grub.d/50_linuxmint.cfg'
Sourcing file `/etc/default/grub.d/init-select.cfg'
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-5.15.0-86-generic \
Found initrd image: /boot/initrd.img-5.15.0-86-generic \
Found linux image: /boot/vmlinuz-5.15.0-76-generic \
Found initrd image: /boot/initrd.img-5.15.0-76-generic \___ 21.2 material
Found linux image: /boot/vmlinuz-5.15.0-73-generic /
Found initrd image: /boot/initrd.img-5.15.0-73-generic /
Warning: os-prober will be executed to detect other bootable partitions.
Its output will be used to detect bootable binaries on them and create new boot entries.
Found Windows Boot Manager on /dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi
Found Linux Mint 21.1 Vera (21.1) on /dev/sda5
Adding boot menu entry for UEFI Firmware Settings ...
done
bullwinkle@CRUISE:~$

Paul

On 10/14/2023 7:17 PM, Paul wrote:
> On 10/15/2023 3:29 AM, bilsch01 wrote:
>> I deleted 2 ext4 partitions and extended my ntfs (Windows) partition by additional 98 GiB, which left about 45 GiB space at the end of the SSD.
>> Next, I installed Ubuntu 22.04.3 at the end of the SSD using the 22.04.3 installer on a thumb drive. This gave me back my boot menu, which had disappeared when I deleted Ubuntu - good.
>>
>> The new boot menu has no option to enter EFI setup. I really want that option on the menu - I really want that. Someone suggested this problem might be because I booted my Ubuntu 22.04.3 installer in 'compatibility' mode, instead of EFI mode. They said if Ubuntu does not have the directory
>> sys.firmware.efi
>> then I must have booted the installer in compatibility mode. However I DO have directory
>> sys.firmware.efi. Furthermore, nowhere do I find an option to choose "compatibility" or "EFI" when booting the Ubuntu installer.
>>
>> Can anyone tell me how to add the EFI option to the (grub) boot menu.
>>
>> TIA.   Bill S
>
> https://www.baeldung.com/linux/grub-bootloader-add-new-os
>
> "
> $ sudo cat /etc/default/grub | grep 'GRUB_DISABLE_OS_PROBER'
> GRUB_DISABLE_OS_PROBER=true
>
> If we get false, then it shows os-prober is active. That example needs to be changed.
>
> # sudo update-grub
> "
>
> apt search os-prober
>
> sudo apt install os-prober # If it is not currently installed
>
> That's the kind of material, to make GRUB pick up windows OSes.
> Check your os-prober, before doing the update-grub.
>
> [Picture]
>
> https://i.postimg.cc/WzrWxRY7/Boot-Menu-Multiboot-Mix.gif
>
> This is what the update-grub looks like, when I run it there.
> This would correspond to the provided [Picture].
>
> bullwinkle@CRUISE:~$ sudo update-grub
> Sourcing file `/etc/default/grub'
> Sourcing file `/etc/default/grub.d/50_linuxmint.cfg'
> Sourcing file `/etc/default/grub.d/init-select.cfg'
> Generating grub configuration file ...
> Found linux image: /boot/vmlinuz-5.15.0-86-generic \
> Found initrd image: /boot/initrd.img-5.15.0-86-generic \
> Found linux image: /boot/vmlinuz-5.15.0-76-generic \
> Found initrd image: /boot/initrd.img-5.15.0-76-generic \___ 21.2 material
> Found linux image: /boot/vmlinuz-5.15.0-73-generic /
> Found initrd image: /boot/initrd.img-5.15.0-73-generic /
> Warning: os-prober will be executed to detect other bootable partitions.
> Its output will be used to detect bootable binaries on them and create new boot entries.
> Found Windows Boot Manager on /dev/sda1@/EFI/Microsoft/Boot/bootmgfw.efi
> Found Linux Mint 21.1 Vera (21.1) on /dev/sda5
> Adding boot menu entry for UEFI Firmware Settings ...
> done
> bullwinkle@CRUISE:~$
>
> Paul

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.