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System: Linux Debian-10-xxxx 4.19.0-11-amd64 #1 SMP Debian 4.19.146-1 (2020-09-17) x86_64 GNU/Linux.

I've got an EFI Linux/Windows dual boot system with clonezilla and gparted entries.
I installed a memtest86 image, and made its grub related entry 43_custom.

I'm trying to update my grub menu, but update-grub only reports Linux options while update and no modification is done to grub.cfg even though update-grub doesn't report any issue.

I took a look at menu.lst and no other entries are listed but Linux. I edited grub.cfg to add some entries and this method is working, but what will happend after a kernel update.

By the way, grub customizer was installed a few days ago, but I uninstalled it because it completily changed grub folders structure. After customizer unistall I run these with su permissions:

apt-get purge grub-common
apt-get purge grub  
apt-get purge os-prober  
apt-get install grub  
apt-get install os-prober  
update-grub  

No changes applied to grub.cfg after update.
If I rename grub.cfg to grub.cfg.bak and run update-grub, no grub.cfg is generated.

update-grub printout:

Searching for GRUB installation directory ... found: /boot/grub 

Searching for default file ... found: /boot/grub/default  
Testing for an existing GRUB menu.lst file ... found: /boot/grub/menu.lst  
Searching for splash image ... none found, skipping ...  
Found kernel: /boot/vmlinuz-4.19.0-11-amd64  
Found kernel: /boot/vmlinuz-4.19.0-10-amd64  
Updating /boot/grub/menu.lst ... done

Any advise will be really welcome, thanks

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The reason your grub.cfg is not updated is because you have grub-legacy installed which uses /boot/grub/menu.lst. The grub package is a virtual package for grub-legacy.

Purge the grub-legacy package and install grub-efi. It contains everything you need (grub-efi-amd64, grub2-common, etc.). Then (re)install grub and run update-grub to regenerate /boot/grub/grub.cfg:

sudo apt purge grub-legacy
sudo apt install grub-efi
sudo grub-install
sudo update-grub
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Thanks dude ! You nailed it ! But now , grub only shows my linux and windows entries.
what sould I do to get my clonezilla, gparted and memtest 86 options get shown on boot menu ?
Files 40 ,41 & 42_custom are located in /etc/grub.d but update-grub is not detecting them.
And should I edit the files ?, because it took me some hours to make them working

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