[Bug 1782849] [NEW] Release Upgrader unable to determine upgrade 17.10 -> 18.04

[Laurie]

Public bug reported:

I tried running the upgrade, and it failed with this error. I saw the
other bug https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-
upgrader/+bug/1767436 that seemed to be a related issue, however I went
back and manually disabled any third-party repos I had setup in the
sources list and tried again, to no avail. I got the same exact error
after disabling those repos.

I was also previously using the
https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers but I used
`ppa-purge` to remove this before attempting the upgrade, as I've heard
that it can cause a broken machine if not removed first.

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: ubuntu-release-upgrader-core 1:17.10.11
ProcVersionSignature: Ubuntu 4.13.0-46.51-generic 4.13.16
Uname: Linux 4.13.0-46-generic x86_64
NonfreeKernelModules: talpa_vfshook talpa_pedconnector talpa_pedevice talpa_vcdevice talpa_core talpa_linux talpa_syscallhook nvidia_uvm nvidia_drm nvidia_modeset nvidia
ApportVersion: 2.20.7-0ubuntu3.9
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Fri Jul 20 17:20:23 2018
InstallationDate: Installed on 2017-11-08 (254 days ago)
InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
UpgradeStatus: Upgraded to artful on 2018-07-20 (0 days ago)

** Affects: ubuntu-release-upgrader (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug artful dist-upgrade

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https://bugs.launchpad.net/bugs/1782849

Title:
  Release Upgrader unable to determine upgrade 17.10 -> 18.04

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

Bug description:
  I tried running the upgrade, and it failed with this error. I saw the
  other bug https://bugs.launchpad.net/ubuntu/+source/ubuntu-release-
  upgrader/+bug/1767436 that seemed to be a related issue, however I
  went back and manually disabled any third-party repos I had setup in
  the sources list and tried again, to no avail. I got the same exact
  error after disabling those repos.

  I was also previously using the
  https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers but I
  used `ppa-purge` to remove this before attempting the upgrade, as I've
  heard that it can cause a broken machine if not removed first.

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-release-upgrader-core 1:17.10.11
  ProcVersionSignature: Ubuntu 4.13.0-46.51-generic 4.13.16
  Uname: Linux 4.13.0-46-generic x86_64
  NonfreeKernelModules: talpa_vfshook talpa_pedconnector talpa_pedevice talpa_vcdevice talpa_core talpa_linux talpa_syscallhook nvidia_uvm nvidia_drm nvidia_modeset nvidia
  ApportVersion: 2.20.7-0ubuntu3.9
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: KDE
  Date: Fri Jul 20 17:20:23 2018
  InstallationDate: Installed on 2017-11-08 (254 days ago)
  InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-07-20 (0 days ago)

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