The error in your log is:
Setting up shim-signed (1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1) ...
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 /etc/fstab and show the output of 'ls -lAR /boot/efi'.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1712669
Title:
package shim-signed 1.32~16.04.1+0.9+1474479173.6c180c6-1ubuntu1
failed to install/upgrade: subprocess installed post-installation
script returned error exit status 1
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