Furthermore, I looked for the postinst script and found out that it's
just the « grub-install » command which fails.
root@ingatech-XPS-13-9343:~# LC_ALL=C grub-install
Installing for x86_64-efi platform.
Could not delete variable: Invalid argument
grub-install: error: efibootmgr failed to register the boot entry: Block device
The attached file is a dump of a grub-install -v
Hope this helps...
** Attachment added: "grub-install -v"
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package grub-efi-amd64-signed 1.93+2.02-2ubuntu8 failed to
install/upgrade: installed grub-efi-amd64-signed package post-
installation script subprocess returned error exit status 1
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