The error in your logs is:
Setting up shim-signed (1.18~16.04.1+0.8-0ubuntu2) ...
Installation pour la plate-forme x86_64-efi
grub-install : erreur : impossible de trouver le répertoire EFI.
dpkg: error processing package shim-signed (--configure):
subprocess installed post-installation script returned error exit status 1
Please attach your /etc/fstab file and show the output of the 'mount'
command.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1625138
Title:
package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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