The log shows:
Installing for x86_64-efi platform.
grub-install: warning: Cannot read EFI Boot* variables.
grub-install: warning: read_file: could not read from file: Input/output error.
grub-install: warning: vars_get_variable:
read_file(/sys/firmware/efi/vars/Boot0001-8be4df61-93ca-11d2-aa0d-00e098032b8c/raw_var)
failed: Input/output error.
grub-install: warning: efi_get_variable: ops->get_variable failed: Input/output
error.
grub-install: error: failed to register the EFI boot entry: Input/output error.
This is not about running in insecure mode, it's about the fact that you
are on an EFI system but the /sys/firmware/efi mount point that the
kernel uses to expose EFI nvram variables to the system is unusable.
We have had a number of reports of such problems but have yet to isolate
a cause.
Opening a bug task on the kernel, since this may be a kernel filesystem
bug.
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1928352
Title:
package shim-signed 1.47+15.4-0ubuntu2 failed to install/upgrade:
installed shim-signed package post-installation script subprocess
returned error exit status 1
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