The Installation failed when trying to install grub-efi-amd64-signed.
Then I open a shell and chroot me on the target system before updating the 
system.
Then, I try to install manually grub-efi-amd64-bin with the parameter 
--fix-missing because without, everything crached lamentably. It seem to be the 
hash between the cdrom ??? I'v installed it via usb key with the iso file. 

Oh yeah, I see the cdrom at /cdrom who contain the cdrom from the key at
sda1.

The checksum seem to not corresponding why ??? The iso come from your site, 
version :
+---------------------------------------------------------------------------------------------------------------+
| Origin: Ubuntu               
| Label: Ubuntu
| Suite: focal
| Version: 20.04
| Codename: focal
| Date: Thu, 23 Apr 2020 17:33:17 UTC
| Architectures: amd64 i386
| Components: main restricted
| Description: Ubuntu Focal 20.04
| Acquire-By-Hash: yes
| SHA256:
|  44fa689d816504f1c9ba27b08d46f25a4897a4f21ced7921f5a8530e32ce0b60       95 
main/binary- amd64/Release
|  0ddb4d5173aaebfecc84f1c2141b800e1383aa30d95551d3dc077b00edc87a53    32859 
main/binary- amd64/Packages.gz
|  485f21ce519cd8cbc76b74f1c8be5ecb66e6ccf7360786176dc33cce3fcd44c2   129561 
main/binary-amd64/Packages
|  136e603984989c1db83d4cef46881f5b197d65120c49fc718e0a81bb21a166bf       94 
main/binary-i386/Release
|  046ffca8fe73b0be51b4bc545534a305bcf60eeda25a0e20310d7d56aaf3c84f    30483 
main/binary-i386/Packages.gz
|  4af2902b57f5f0054055b4b9f7dce8cb0a4cce6f1ccaa2897f86c227e0501569   124289 
main/binary-i386/Packages
|  d8f70ca1fe1aaab95538a2c4d45118be407c0c479a247a41b2de094041cb940a      101 
restricted/binary-amd64/Release
|  fc10faec5274c2c42ae6b9b24c3f8357093148ded718aad9cab55975b301cdf0    28441 
restricted/binary-amd64/Packages.gz
|  22b7ef09670506420b66f44377fa8f706b7449589cf38067eec0798ba5863e6c   204178 
restricted/binary-amd64/Packages
|  f51659fc018cde566f5297af01955e5749d53de3bce71c14e132e02ae6ca4363      100 
restricted/binary-i386/Release
|  6148b566ec8669e2a7da86674f209ef7bfb8766a5a12cc091bf942022a2b1a12     4705 
restricted/binary-i386/Packages.gz
|  39140436e2282ccf3691129ee086e1d7bffee745118b9fe06bd4f71d62dc7fa0    21508 
restricted/binary-i386/Packages
+---------------------------------------------------------------------------------------------------------------+

The result of the installation command 
--------------------------------------

root@ubuntu:/# sudo apt install grub-efi-amd64-bin --fix-missing
Lecture des listes de paquets... Fait
Construction de l'arbre des dépendances       
Lecture des informations d'état... Fait
Les paquets supplémentaires suivants seront installés : 
  efibootmgr grub-efi-amd64-signed
Les NOUVEAUX paquets suivants seront installés :
  efibootmgr grub-efi-amd64-bin grub-efi-amd64-signed
0 mis à jour, 3 nouvellement installés, 0 à enlever et 0 non mis à jour.
Il est nécessaire de prendre 0 o/1239 ko dans les archives.
Après cette opération, 12.6 Mo d'espace disque supplémentaires seront utilisés.
Souhaitez-vous continuer ? [Y/n] Y
Réception de :1 cdrom://Ubuntu 20.04.3 LTS _Focal Fossa_ - Release amd64 
(20210819) focal/main amd64 efibootmgr amd64 17-1 [28.1 kB]
Err :1 cdrom://Ubuntu 20.04.3 LTS _Focal Fossa_ - Release amd64 (20210819) 
focal/main amd64 efibootmgr amd64 17-1
  Somme de contrôle de hachage incohérente
  Hashes of expected file:
   - 
SHA512:e67f183bff2b124ff937a26fd42e409855b67bfb68726466503f184997d7a315d11fcde4a00635175b335beae305ae0fbfdfb4af12f4847955df7eeec4e6dedd
   - SHA256:0da33e43c97e5505d4d54e4145a72e76ce72278c3a9488792da86d9f30709d73
   - Filesize:28132 [weak]
   - SHA1:807ad0748d7d68ce286c6f8106aa0a2b80a9b085 [weak]
   - MD5Sum:f96cb80db02d40b2b7fb23e76cbef5f4 [weak]
  Hashes of received file:
   - 
SHA512:68cbe675ef07eeda8ebd947cf5cece8d402ab28af24aaa0b08e045eae3ce628f07ada05179ca78c2db5e44a794e41dd86f1a0d6e4a8c8d4ebf306237c7531256
   - SHA256:4dfac95bc02e26513ce2459a98c37c239b1b8c62fd3c785d7041a18d1abbdbfd
   - SHA1:62250f8f28f8694dae19641f374e79da5192020a [weak]
   - MD5Sum:6088c4440abf2bb604d0818da6ffbcf7 [weak]
   - Filesize:28132 [weak]
  Last modification reported: Thu, 20 Feb 2020 05:18:30 +0000
Réception de :2 cdrom://Ubuntu 20.04.3 LTS _Focal Fossa_ - Release amd64 
(20210819) focal/main amd64 grub-efi-amd64-bin amd64 2.04-1ubuntu44.2 [729 kB]
Réception de :3 cdrom://Ubuntu 20.04.3 LTS _Focal Fossa_ - Release amd64 
(20210819) focal/main amd64 grub-efi-amd64-signed amd64 
1.167.2+2.04-1ubuntu44.2 [482 kB]
E: Impossible d'écrire le journal (Est-ce que /dev/pts est monté ?) - 
posix_openpt (19: Aucun périphérique de ce type)
Sélection du paquet grub-efi-amd64-bin précédemment désélectionné.
(Lecture de la base de données... 229160 fichiers et répertoires déjà 
installés.)
Préparation du dépaquetage de .../grub-efi-amd64-bin_2.04-1ubuntu44.2_amd64.deb 
...
Dépaquetage de grub-efi-amd64-bin (2.04-1ubuntu44.2) ...
Sélection du paquet grub-efi-amd64-signed précédemment désélectionné.
Préparation du dépaquetage de 
.../grub-efi-amd64-signed_1.167.2+2.04-1ubuntu44.2_amd64.deb ...
Dépaquetage de grub-efi-amd64-signed (1.167.2+2.04-1ubuntu44.2) ...
Paramétrage de grub-efi-amd64-bin (2.04-1ubuntu44.2) ...
Paramétrage de grub-efi-amd64-signed (1.167.2+2.04-1ubuntu44.2) ...
E: Impossible de récupérer cdrom://Ubuntu 20.04.3 LTS _Focal Fossa_ - Release 
amd64 (20210819)/pool/main/e/efibootmgr/efibootmgr_17-1_amd64.deb  Somme de 
contrôle de hachage incohérente
   Hashes of expected file:
    - 
SHA512:e67f183bff2b124ff937a26fd42e409855b67bfb68726466503f184997d7a315d11fcde4a00635175b335beae305ae0fbfdfb4af12f4847955df7eeec4e6dedd
    - SHA256:0da33e43c97e5505d4d54e4145a72e76ce72278c3a9488792da86d9f30709d73
    - Filesize:28132 [weak]
    - SHA1:807ad0748d7d68ce286c6f8106aa0a2b80a9b085 [weak]
    - MD5Sum:f96cb80db02d40b2b7fb23e76cbef5f4 [weak]
   Hashes of received file:
    - 
SHA512:68cbe675ef07eeda8ebd947cf5cece8d402ab28af24aaa0b08e045eae3ce628f07ada05179ca78c2db5e44a794e41dd86f1a0d6e4a8c8d4ebf306237c7531256
    - SHA256:4dfac95bc02e26513ce2459a98c37c239b1b8c62fd3c785d7041a18d1abbdbfd
    - SHA1:62250f8f28f8694dae19641f374e79da5192020a [weak]
    - MD5Sum:6088c4440abf2bb604d0818da6ffbcf7 [weak]
    - Filesize:28132 [weak]
   Last modification reported: Thu, 20 Feb 2020 05:18:30 +0000

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https://bugs.launchpad.net/bugs/889598

Title:
  Installer failed when installing grub (EFI system)

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