Your log shows that you had a functioning, installed system using the
BIOS version of grub (grub-pc 2.02~beta2-36ubuntu3); then you
subsequently installed grub-efi-amd64-signed and shim-signed, which are
packages specific to the UEFI version of grub. Why did you install
these packages?
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1574355
Title:
package shim-signed 1.12+0.8-0ubuntu2 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 1
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