Public bug reported:

Just wanted to upgrade a 14.04 LTS to 16.04 LTS with update-manager -d

Aborts with

Checking for a new Ubuntu release
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:86: Warning: 
g_object_ref: assertion 'object->ref_count > 0' failed
  res = self.widgets.dialog_release_notes.run()
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:86: Warning: 
g_object_unref: assertion 'object->ref_count > 0' failed
  res = self.widgets.dialog_release_notes.run()
authenticate 'xenial.tar.gz' against 'xenial.tar.gz.gpg' 
gpg exited 1
Debug information: 


gpg: Signature made Sa 16 Apr 2016 18:33:59 CEST using DSA key ID 437D05B5
gpg: /tmp/ubuntu-release-upgrader-yr0ts0k7/trustdb.gpg: trustdb created
gpg: BAD signature from "Ubuntu Archive Automatic Signing Key 
<ftpmas...@ubuntu.com>"

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: ubuntu-release-upgrader-core 1:0.220.8
ProcVersionSignature: Ubuntu 3.13.0-85.129-generic 3.13.11-ckt36
Uname: Linux 3.13.0-85-generic x86_64
NonfreeKernelModules: zfs zunicode zcommon znvpair zavl
ApportVersion: 2.14.1-0ubuntu3.19
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: XFCE
Date: Fri Apr 22 18:23:55 2016
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: ubuntu-release-upgrader
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug dist-upgrade trusty

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https://bugs.launchpad.net/bugs/1573692

Title:
  BAD signature from "Ubuntu Archive Automatic Signing Key
  <ftpmas...@ubuntu.com>"

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