[Bug 1767626] Re: cannot upgrade to bionic beaver 18.04 lts

[Brian Murray]

*** This bug is a duplicate of bug 1611737 ***
    https://bugs.launchpad.net/bugs/1611737

** This bug has been marked a duplicate of bug 1611737
   Can't upgrade from a release if ros packages are  installed from ROS servers

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https://bugs.launchpad.net/bugs/1767626

Title:
  cannot upgrade to bionic beaver 18.04 lts

Status in ubuntu-release-upgrader package in Ubuntu:
  Incomplete

Bug description:
  (appstreamcli:3249): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:3249): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:3249): GLib-CRITICAL **: g_strchug: assertion 'string !=
  NULL' failed

  (appstreamcli:3249): 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 4.13.0-39.44~16.04.1-generic 4.13.16
  Uname: Linux 4.13.0-39-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.16
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: Unity
  Date: Sat Apr 28 15:55:06 2018
  InstallationDate: Installed on 2018-03-10 (48 days ago)
  InstallationMedia: Ubuntu 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.2)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-04-28 (0 days ago)

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