[Bug 1797324] Re: Software Updater show empty panels, stuck in ProblemResolver.resolve of apt_pkg.cpython-36m-x86_64-linux-gnu.so

[Ubuntu Foundations Team Bug Bot]

** Tags added: patch

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Title:
  Software Updater show empty panels, stuck in ProblemResolver.resolve
  of apt_pkg.cpython-36m-x86_64-linux-gnu.so

Status in python-apt package in Ubuntu:
  New
Status in update-manager package in Ubuntu:
  New

Bug description:
  I just happened to see that Software Updater popped up with an actually empty window:
  1. nothing in "install or remove"
  2. obviously no details for changes/descriptions

  But at the same time it says "26.3 MB will be downloaded"
  I'll attach a screenshot of that to show what I mean.

  At the same time there are upgradable packages:
  $ apt list --upgradable
  Listing... Done
  apturl/bionic-updates 0.5.2ubuntu14.2 amd64 [upgradable from: 0.5.2ubuntu14]
  apturl-common/bionic-updates 0.5.2ubuntu14.2 amd64 [upgradable from: 0.5.2ubuntu14]
  flashplugin-installer/bionic-updates,bionic-security 31.0.0.122ubuntu0.18.04.1 amd64 [upgradable from: 31.0.0.108ubuntu0.18.04.1]
  gir1.2-javascriptcoregtk-4.0/bionic-updates,bionic-security 2.22.2-0ubuntu0.18.04.2 amd64 [upgradable from: 2.22.2-0ubuntu0.18.04.1]
  [...]

  And that matches the 26.3MB
  $ sudo apt upgrade
  [...]
  22 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
  Need to get 26,3 MB of archives.

  
  I can restart it to get the same symptom, done in console one indicator of a problem is:
  $ /usr/bin/python3 /usr/bin/update-manager --no-update --no-focus-on-map
  Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings

  Also https://changelogs.ubuntu.com/meta-release-lts is reachable for
  me.

  But even if it would be not reachable, why then "26.3MB will be
  downloaded" - it seems to know some things?

  I'd either expect a user visible error (UI) or listing the packages apt knows about to upgrade.
  But not "nothing"

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: update-manager 1:18.04.11.5
  ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
  Uname: Linux 4.15.0-36-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.4
  Aptdaemon:
   
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Thu Oct 11 09:36:19 2018
  ExecutablePath: /usr/bin/update-manager
  GsettingsChanges:
   b'com.ubuntu.update-manager' b'show-details' b'true'
   b'com.ubuntu.update-manager' b'window-height' b'625'
   b'com.ubuntu.update-manager' b'first-run' b'false'
   b'com.ubuntu.update-manager' b'window-width' b'645'
   b'com.ubuntu.update-manager' b'launch-time' b'int64 1539243337'
  InstallationDate: Installed on 2016-02-19 (964 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  InterpreterPath: /usr/bin/python3.6
  PackageArchitecture: all
  Python3Details: /usr/bin/python3.6, Python 3.6.6, python3-minimal, 3.6.5-3ubuntu1
  PythonDetails: /usr/bin/python2.7, Python 2.7.15rc1, python-minimal, 2.7.15~rc1-1
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to bionic on 2018-05-03 (160 days ago)

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