You are booting on a UEFI-based system, but you have installed the grub-
pc package, which is incompatible. You need to reinstall the grub-efi-
amd64 package, which is the compatible bootloader for your system.
** Changed in: shim-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1252787
Title:
package shim-signed 1.5~12.04.2+0.4-0ubuntu4 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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