[Bug 1771852] Re: In update-manager I see error "no internet connection", but it isn't true. And update of Ubuntu is no possible for me

[Jean-Baptiste Lallement]

Thanks for your report.

Disregard dino99 comment, it is incorrect and misleading.

One of the reason of the upgrade failure are invalid entries in
/etc/sources.list that point to a no longer available release:

deb http://archive.ubuntu.com/ubuntu zesty main universe restricted multiverse
deb-src http://archive.ubuntu.com/ubuntu zesty main universe restricted multiverse #Added by software-properties
deb http://security.ubuntu.com/ubuntu/ zesty-security main restricted multiverse universe
deb http://archive.ubuntu.com/ubuntu zesty-updates main restricted multiverse universe

Besides these duplicates the lines for artful and you can just remove
them then attempt the upgrade again. If it fails again then don't
hesitate to file another report.

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

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https://bugs.launchpad.net/bugs/1771852

Title:
  In update-manager I see error "no internet connection", but it isn't
  true. And update of Ubuntu is no possible for me

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

Bug description:
  software-properties-gtk probably doesn't work correct too.
  I am desperate. Update of Ubuntu doesn't work for me :(.
  I use Ubuntu with Cinnamon graphical interface.
  I reinstalled software-propertie and software-propertie via Synaptic, but it doesn't help me.
  I have Slovak language in Ubuntu.
  I send you more screen-shots. 
  (you support only one file in attachment, I send you screen-shots in zip file)

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-41.46-generic 4.13.16
  Uname: Linux 4.13.0-41-generic x86_64
  ApportVersion: 2.20.7-0ubuntu3.8
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: X-Cinnamon
  Date: Thu May 17 17:29:08 2018
  InstallationDate: Installed on 2016-12-03 (529 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160720)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=sk_SK
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=sk_SK.UTF-8
   SHELL=/bin/bash
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-05-17 (0 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2018-05-17 16:20:23.507926
   Log time: 2018-05-17 16:20:35.638775
   Log time: 2018-05-17 16:24:37.386152
  VarLogDistupgradeTermlog:

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