This seems to be working correctly. The device you installed to no
longer exists, so you need to select a different one. Since you are non-
interactive, you cannot select a different one, so the upgrade has no
choice but to fail.
You are of course free to preseed the correct values for the option or
change to the new cloud image installation style where supported:
Template: grub-efi/cloud_style_installation
Type: boolean
Default: false
_Description: Choose installation target based on the device containing /boot?
** Changed in: shim-signed (Ubuntu)
Status: New => Opinion
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https://bugs.launchpad.net/bugs/2080297
Title:
installed shim-signed package post-installation script subprocess
returned error exit status 32
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