The error in the log is:
Installation pour la plate-forme x86_64-efi
grub-install : erreur : impossible de trouver le répertoire EFI.
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
Do you know why /boot/efi is not mounted on your system? Please attach
your /etc/fstab file.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1733949
Title:
package shim-signed 1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
failed to install/upgrade: le sous-processus script post-installation
installé a retourné une erreur de sortie d'état 1
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