Public bug reported:

$ sudo do-release-upgrade -d
Checking for a new Ubuntu release
Upgrades to the development release are only 
available from the latest supported release.


$ update-manager
/usr/bin/update-manager:28: PyGIWarning: Gtk was imported without specifying a 
version first. Use gi.require_version('Gtk', '3.0') before import to ensure 
that the right version gets loaded.
  from gi.repository import Gtk
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: 
Dbusmenu was imported without specifying a version first. Use 
gi.require_version('Dbusmenu', '0.4') before import to ensure that the right 
version gets loaded.
  from gi.repository import Dbusmenu, Unity
/usr/lib/python3/dist-packages/UpdateManager/UnitySupport.py:29: PyGIWarning: 
Unity was imported without specifying a version first. Use 
gi.require_version('Unity', '7.0') before import to ensure that the right 
version gets loaded.
  from gi.repository import Dbusmenu, Unity
Checking for a new Ubuntu release
/usr/lib/python3/dist-packages/DistUpgrade/DistUpgradeFetcher.py:23: 
PyGIWarning: Gtk was imported without specifying a version first. Use 
gi.require_version('Gtk', '3.0') before import to ensure that the right version 
gets loaded.
  from gi.repository import Gtk, Gdk
/usr/lib/python3/dist-packages/DistUpgrade/ReleaseNotesViewerWebkit.py:33: 
PyGIWarning: WebKit2 was imported without specifying a version first. Use 
gi.require_version('WebKit2', '4.0') before import to ensure that the right 
version gets loaded.
  from gi.repository import WebKit2 as WebKit
Gtk-Message: GtkDialog mapped without a transient parent. This is discouraged.
authenticate 'zesty.tar.gz' against 'zesty.tar.gz.gpg' 
extracting 'zesty.tar.gz'

(appstreamcli:26816): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:26816): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed

(appstreamcli:26816): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed

(appstreamcli:26816): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed


Additional info : 

$ sudo apt-cache policy ubuntu-release-upgrader-core
ubuntu-release-upgrader-core:
  Installed: 1:16.04.22
  Candidate: 1:16.04.22
  Version table:
 *** 1:16.04.22 500
        500 http://in.archive.ubuntu.com/ubuntu xenial-updates/main amd64 
Packages
        500 http://in.archive.ubuntu.com/ubuntu xenial-updates/main i386 
Packages
        100 /var/lib/dpkg/status
     1:16.04.12 500
        500 http://in.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        500 http://in.archive.ubuntu.com/ubuntu xenial/main i386 Packages

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04.3 LTS
Release:        16.04
Codename:       xenial

$ uname -a
Linux Puja-Sarang 4.4.0-97-generic #120-Ubuntu SMP Tue Sep 19 17:28:18 UTC 2017 
x86_64 x86_64 x86_64 GNU/Linux

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.22
ProcVersionSignature: Ubuntu 4.4.0-97.120-generic 4.4.87
Uname: Linux 4.4.0-97-generic x86_64
NonfreeKernelModules: wl nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.10
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: Unity
Date: Wed Oct 25 22:56:23 2017
InstallationDate: Installed on 2016-12-24 (305 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2017-10-25 (0 days ago)
VarLogDistupgradeTermlog:
 
mtime.conffile..etc.update-manager.release-upgrades: 2017-10-25T22:07:28.669132

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


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

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https://bugs.launchpad.net/bugs/1727452

Title:
  Cannot calculate the upgrade from 16.04 to 17.04

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