The error message shows that you are trying to install the UEFI version
of grub on a system which is not configured to use UEFI. The apt log
shows what looks like a manual request for this package's installation
on April 15, not as part of an upgrade:
Start-Date: 2016-04-15 23:09:39
Requested-By: ubuntu (999)
Install: linux-image-extra-4.4.0-18-generic:amd64 (4.4.0-18.34, automatic),
linux-headers-4.4.0-18-generic:amd64 (4.4.0-18.34, automatic),
linux-headers-4.4.0-18:amd64 (4.4.0-18.34, automatic),
linux-signed-image-4.4.0-18-generic:amd64 (4.4.0-18.34, automatic),
linux-image-4.4.0-18-generic:amd64 (4.4.0-18.34, automatic)
Upgrade: linux-headers-generic:amd64 (4.4.0.15.16, 4.4.0.18.19),
linux-image-generic:amd64 (4.4.0.15.16, 4.4.0.18.19),
linux-signed-image-generic:amd64 (4.4.0.15.16, 4.4.0.18.19),
linux-signed-generic:amd64 (4.4.0.15.16, 4.4.0.18.19), linux-generic:amd64
(4.4.0.15.16, 4.4.0.18.19)
End-Date: 2016-04-15 23:10:17
Start-Date: 2016-04-15 23:10:33
Requested-By: ubuntu (999)
End-Date: 2016-04-15 23:10:33
Start-Date: 2016-04-15 23:10:37
Commandline: apt-get --no-upgrade -o
Acquire::gpgv::Options::=--ignore-time-conflict -y install grub-efi-amd64-signed
Install: grub-efi-amd64-bin:amd64 (2.02~beta2-36ubuntu2, automatic),
grub-efi-amd64:amd64 (2.02~beta2-36ubuntu2, automatic),
grub-efi-amd64-signed:amd64 (1.65+2.02~beta2-36ubuntu2)
Error: Sub-process /usr/bin/dpkg returned an error code (1)
End-Date: 2016-04-15 23:10:39
Start-Date: 2016-04-15 23:10:41
Commandline: apt-get --no-upgrade -o
Acquire::gpgv::Options::=--ignore-time-conflict -y install shim-signed
Install: shim-signed:amd64 (1.12+0.8-0ubuntu2), shim:amd64 (0.8-0ubuntu2,
automatic)
Prior to this, you had the correct version of grub installed for your
system, grub-pc.
Did you manually choose to install the grub-efi-amd64-signed or shim-
signed packages at some point?
You said that you were installing 16.04 over 12.04, but your logs look
like a system that has been upgraded, not one that is newly installed.
Please provide more detail about the exact steps you took which
triggered this bug.
** Changed in: shim-signed (Ubuntu)
Status: New => Incomplete
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1571103
Title:
Installing 16.04 beta over 12.04 grub install failed, 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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