[Bug 1744722] Re: Unknown bad source brings up during 'zesty' to 'artful' upgrade and It break the process

[ZdravkoG]

I am not very familiar with the Python language (prefer C/C++). It seems file versions we are using are little bit different (lines I suppose You mean, are shifted little up). That's why I attach my version here.
I suppose the wrong value sits in 'entry.dist' field. With method "self.sources.add(entry.type, uri, entry.dist, entry.comps, comment)", erroneous value goes to take effect. Is it possible to insert one line just before noted method call and there to set correct value (just temporary as workaround)? Something like 'entry.dist = "artful"'?
Can I rely that if this don't help me, at least will not disturb current installation?

** Attachment added: "DistUpgradeController.py"
   https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-upgrader/+bug/1744722/+attachment/5041145/+files/DistUpgradeController.py

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https://bugs.launchpad.net/bugs/1744722

Title:
  Unknown bad source brings up during 'zesty' to 'artful' upgrade and It
  break the process

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

Bug description:
  During update after release 'zesty' 'end of life' strange error
  appear:

  E:The repository 'http://archive.ubuntu.com/ubuntu stable Release'
  does not have a Release file.

  This error prevent upgrade process. There is no entry like 'http://archive.ubuntu.com/ubuntu stable Release' in my 'sources.list'. I have no idea where this entry comes from. During regular packages update try, only appears error messages directly related to 'end of life' release state. No error like above. I am not sure, but it seems like 'http://archive.ubuntu.com/ubuntu stable Release' is wrongly formatted and have no idea where this comes from as all. Here is my sources list (as is now). As could be seen from the sources list my install is from 2014. Over the years I make upgrade after 'end of life' release few times without any problems. Now is the first time I have such issue.
  Thanks in advance!

  ProblemType: Bug
  DistroRelease: Ubuntu 17.04
  Package: ubuntu-release-upgrader-core 1:17.04.10
  ProcVersionSignature: Ubuntu 4.10.0-42.46-generic 4.10.17
  Uname: Linux 4.10.0-42-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.20.4-0ubuntu4.10
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Mon Jan 22 15:56:24 2018
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-07-12 (1289 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to zesty on 2018-01-20 (2 days ago)
  VarLogDistupgradeAptlog:
   Log time: 2018-01-20 03:20:51.814404
   Log time: 2018-01-20 03:20:56.946483
   Log time: 2018-01-20 03:21:25.049488

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