You appear to be installing the shim-signed package in error on a non-
UEFI system. The error message from 'grub-install' shows that grub-
install has autodetected your system as running a PC BIOS, not UEFI and
is thus trying to install the BIOS version of GRUB which it then does
not find on your system. You probably need to run 'apt install grub-pc'
to correct this.
** Changed in: shim-signed (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1590354
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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