It appears grub-installer has failed because of an I/O error:
Oct 19 07:56:43 ubuntu ubiquity: grub-install : erreur : efibootmgr failed to
register the boot entry: Erreur d'entrée/sortie.
Oct 19 07:56:43 ubuntu ubiquity: dpkg: error processing package
grub-efi-amd64-signed (--configure):
Oct 19 07:56:43 ubuntu ubiquity: installed grub-efi-amd64-signed package
post-installation script subprocess returned error exit status 1
What kind of make/model is the machine you are installing on?
** Changed in: grub-installer (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1798746
Title:
Grub install fail - ubuntu 18.10
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