Public bug reported:
Upgrading from 16.04.5 to 18.04.1 using `update-manager -c` fails with
the message:
"""
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
This can be caused by:
* Upgrading to a pre-release version of Ubuntu
* Running the current pre-release version of Ubuntu
* Unofficial software packages not provided by Ubuntu
If none of this applies, then please report this bug using the command
'ubuntu-bug ubuntu-release-upgrader-core' in a terminal.
"""
I'm neither in the first nor in the second case. I can't tell whether
I'm in the third case because no list of offending packages is
displayed. Neither does update-manager's stdout contain further hints:
$ update-manager -c --debug
/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
DEBUG:AptClient.DebconfProxy:debconf socket:
/tmp/aptdaemon-_wdtxlvw/debconf.socket
DEBUG:root:debconf.start()
DEBUG:root:debconf.stop()
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 'bionic.tar.gz' against 'bionic.tar.gz.gpg'
extracting 'bionic.tar.gz'
(appstreamcli:31911): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:31911): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed
(appstreamcli:31911): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:31911): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed
(appstreamcli:31911): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:31911): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL'
failed
AppStream cache update completed, but some metadata was ignored due to errors.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.25
ProcVersionSignature: Ubuntu 4.4.0-135.161-generic 4.4.140
Uname: Linux 4.4.0-135-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: MATE
Date: Tue Sep 25 12:15:43 2018
InstallationDate: Installed on 2015-02-04 (1329 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2018-09-25 (0 days ago)
VarLogDistupgradeTermlog:
** Affects: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug dist-upgrade third-party-packages xenial
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https://bugs.launchpad.net/bugs/1794273
Title:
Could not calculate the upgrade
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