grub 2.12 compile and install - location of binaries or how to generate and cryptomount issue on ubuntu 22.04

[anand akhare]

Hello,
    I have ubuntu 22.04 with grub 2.06. I wanted to compile grub 2.12 and get 
it on ubuntu. Reason is I want to encrypt boot partition and cryptomount is not 
able to detect boot partition which is luks1 which is with default apt package 
of ubuntu of grub. When I compiled, below configure command is used:

./configure --prefix=<instal_dir> --target=x86_64 --with-platform=efi

The installed ubuntu package grub is grub-efi-amd64-signed
With this in dir /usr/lib/grub has below entries

/usr/lib/grub$ ls
grub-mkconfig_lib  grub-multi-install  i386-pc  x86_64-efi  x86_64-efi-signed

Also, x86_64-efi directory has

/usr/lib/grub$ ls x86_64-efi/monolithic/
gcdx64.efi  grubnetx64.efi  grubx64.efi

I do not see multiple target platform dirs on compilation and installation of 
2.12 in local directory as well as single grub executable grubx64.efi

~/grub/install$ ls lib/grub/x86_64-efi/*grub*
lib/grub/x86_64-efi/gdb_grub


~/grub/install$ ls -l lib/grub/x86_64-efi/* | grep "^d"
~/grub/install$

grub-mkconfig is found in install/share directory.

~/grub/install/share/grub$ ls
grub-mkconfig_lib

Where is grubx64.efi that will be installed in /boot/efi?

Also, /boot/efi/EFI/ubuntu has some more binaries

# ls /boot/efi/EFI/ubuntu/
BOOTX64.CSV  grub.cfg     grubx64.efi  mmx64.efi    shimx64.efi

When grub-install is triggered, from where do these binaries grub pick up?
Based on this query, I need to sign grub binary which I believe is grubx64.efi.

Pls clarify on this where can I get binaries of grub and which ones are 
required to be signed?
I believe grub-install will pick up grub bootloader from lib/grub directory and 
copy in efi. Pls correct me if mistaken.

Also, cryptomount problem if is evident in 2.06, pls clarify. Is it worth 
effort to move to 2.12 grub to get encrypted boot with grub2.
cryptomount gives error that "no such cryptodisk" though it is detected in 
ubuntu with disks utility.


Regards
Anand