[Bug 1783619] Re: do-release-upgrade fails to calculate upgrade due to ubuntu-toolchain PPA

[Brian Murray]

You have quite a few PPAs enabled and they can cause release upgrades to
fail as they may provide package versions which are greater than those
in the Ubuntu archive. One PPA which stands out to me is the ubuntu-
toolchain PPA - you can try disabling it and removing its packages using
the tool 'ppa-purge' from the package of the same name. After that
please try the upgrade again.

** Summary changed:

- do-release-upgrade fails to calculate upgrade, crashes because appstreamcli crashes iin a g_str* assertion
+ do-release-upgrade fails to calculate upgrade due to ubuntu-toolchain PPA

** Changed in: ubuntu-release-upgrader (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1783619

Title:
  do-release-upgrade fails to calculate upgrade due to ubuntu-toolchain
  PPA

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

Bug description:
  Get:66 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata [5,100 B]                                                                
  Get:67 http://us.archive.ubuntu.com/ubuntu bionic-backports/universe DEP-11 64x64 Icons [1,789 B]                                                                   
  Fetched 76.8 MB in 6s (1,564 kB/s)                                                                                                                                  

  (appstreamcli:29485): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:29485): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:29485): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:29485): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:29485): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:29485): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:29485): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:29485): GLib-CRITICAL **: g_strchomp: assertion 'string
  != NULL' failed

  (appstreamcli:29485): GLib-CRITICAL **: g_strchug: assertion 'string
  != NULL' failed

  (appstreamcli:29485): 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 1:16.04.25
  ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.18
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: XFCE
  Date: Wed Jul 25 13:53:15 2018
  InstallationDate: Installed on 2016-10-24 (638 days ago)
  InstallationMedia: Ubuntu-Server 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.3)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to xenial on 2018-07-25 (0 days ago)

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