This is a bug in the shim-signed package.  Versions of shim-signed in
14.04 and later rely on the --target feature of grub-install, which is
only available in grub 2.00 and above.  So shim-signed should have a
versioned dependency on grub2-common.

Your attached logs also show that you have tried to run 'apt-get
upgrade' to upgrade between precise and trusty.  Please note that this
is absolutely unsupported.  'apt-get upgrade' will not install new
packages, which is a requirement when upgrading between major releases.
You must at minimum run 'apt-get dist-upgrade'.  It is recommended that
you run 'do-release-upgrade' for commandline upgrades between releases,
or use 'update-manager' for desktop upgrades.

** Changed in: shim-signed (Ubuntu)
   Importance: Undecided => High

** Changed in: shim-signed (Ubuntu)
       Status: New => Triaged

** Also affects: shim-signed (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Also affects: shim-signed (Ubuntu Wily)
   Importance: High
       Status: Triaged

** Also affects: shim-signed (Ubuntu Utopic)
   Importance: Undecided
       Status: New

** Also affects: shim-signed (Ubuntu Vivid)
   Importance: Undecided
       Status: New

** Changed in: shim-signed (Ubuntu Vivid)
       Status: New => Triaged

** Changed in: shim-signed (Ubuntu Vivid)
   Importance: Undecided => High

** Changed in: shim-signed (Ubuntu Utopic)
       Status: New => Triaged

** Changed in: shim-signed (Ubuntu Utopic)
   Importance: Undecided => High

** Changed in: shim-signed (Ubuntu Trusty)
       Status: New => Triaged

** Changed in: shim-signed (Ubuntu Trusty)
   Importance: Undecided => High

** Changed in: shim-signed (Ubuntu Utopic)
   Importance: High => Low

** Changed in: shim-signed (Ubuntu Vivid)
   Importance: High => Low

** Changed in: shim-signed (Ubuntu Wily)
   Importance: High => Low

-- 
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/1474203

Title:
  package shim-signed 1.6+0.4-0ubuntu4 failed to install/upgrade:
  subprocess installed post-installation script returned error exit
  status 1

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