The full error in the logs attached to your bug report is:
Paramétrage de grub-efi-amd64-signed (1.66.2+2.02~beta2-36ubuntu3.2) ...
grub-install : erreur : /usr/lib/grub/i386-pc/modinfo.sh n'existe pas. Veuillez
utiliser --target ou --directory.
dpkg: erreur de traitement du paquet grub-efi-amd64-signed (--configure) :
le sous-processus script post-installation installé a retourné une erreur de
sortie d'état 1
Paramétrage de shim-signed (1.19~16.04.1+0.8-0ubuntu2) ...
Installation pour la plate-forme x86_64-efi
grub-install : erreur : impossible de trouver le répertoire EFI.
dpkg: erreur de traitement du paquet shim-signed (--configure) :
le sous-processus script post-installation installé a retourné une erreur de
sortie d'état 1
Do you know if this system uses UEFI? It appears to be a BIOS system
instead, which means it's an error to have shim-signed and grub-efi-
amd64-signed installed: you should have grub-pc installed.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1656543
Title:
package shim-signed 1.19~16.04.1+0.8-0ubuntu2 failed to
install/upgrade: le sous-processus script post-installation installé a
retourné une erreur de sortie d'état 1
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