The error message indicates that shim-signed should not have been
installed on your system, because you are not running UEFI. So it is of
great concern that something is trying to install shim-signed on your
system.
We have previously seen bugs we believe were caused by different parts
of the installer using different methods to detect whether UEFI was in
use, but in your case the installation of shim-signed did not happen at
install time.
Do you know why shim-signed was being installed on your system, or from
what package manager frontend? The only information in your logs is:
Start-Date: 2016-07-31 18:41:47
Commandline: apt-get --no-upgrade -o
Acquire::gpgv::Options::=--ignore-time-conflict -y install shim-signed
Install: shim-signed:amd64 (1.18~16.04.1+0.8-0ubuntu2), shim:amd64
(0.8-0ubuntu2, automatic)
and this doesn't really show what is triggering the install.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1608256
Title:
package shim-signed 1.18~16.04.1+0.8-0ubuntu2 failed to
install/upgrade: subprocess installed post-installation script
returned error exit status 1
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