You have the shim-signed package installed on your system, but you have
the BIOS version of grub (grub-pc) installed instead of the UEFI version
(grub-efi-amd64). On Ubuntu 12.04 it is not possible to enforce a
compatible version of grub-install; you will need to either install
grub-efi-amd64, or,
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: shim-signed (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1492597
Title:
** Tags removed: need-duplicate-check
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https://bugs.launchpad.net/bugs/1492597
Title:
package shim-signed 1.9~12.04.1+0.8-0ubuntu2 failed to
install/upgrade: subprocess installed post