Public bug reported:
Trying to get to 18.04
Stripped out all non-standard PPA references and reran update/upgrade,
completed ok.
But do-release-upgrade failed with with
(appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed
(appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string !=
NULL' failed
(appstreamcli:8886): GLib-CRITICAL **: g_strchug: assertion 'string !=
NULL' failed
(appstreamcli:8886): GLib-CRITICAL **: g_strchomp: assertion 'string != NULL'
failed
AppStream cache update completed, but some metadata was ignored due to errors.
Checking package manager
Reading package lists... Done
Building dependency tree
Reading state information... Done
Calculating the changes
Calculating the changes
Could not calculate the upgrade
An unresolvable problem occurred while calculating the upgrade.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubuntu-release-upgrader-core 1:16.04.26
ProcVersionSignature: Ubuntu 4.4.0-146.172-generic 4.4.177
Uname: Linux 4.4.0-146-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CrashDB: ubuntu
Date: Thu Apr 11 00:08:23 2019
InstallationDate: Installed on 2012-07-06 (2469 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64
(20120425)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to xenial on 2019-04-11 (0 days ago)
mtime.conffile..etc.update-manager.release-upgrades: 2019-04-10T22:40:31.357962
** 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/1824276
Title:
releaser-upgrade failure 16.04.6LTS
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