[Bug 1783438] Re: Release Upgrader unable to determine upgrade

[Laurie]

I do have an NVidia GPU, and am using the drivers from
https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa. However, I
noticed on a couple of the other similar bugs that have been reported,
this repo can also provide packages that prevent the upgrade from
working.

So, I'm trying to purge that repo and downgrade the packages, but when I
run `sudo add-apt-repository ppa:graphics-drivers/ppa` I get an error
that it cannot find the package list for this repo, and as such it
refuses to remove it and make the necessary changes. I tried adding the
repo again, and then running the same command again to purge it, but
same issue.

I just want to get this sorted out. What do I need to do to get this to
work properly, short of having to wipe my entire machine, do a fresh
install, and spend a week or more restoring my settings and data from
backups?

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https://bugs.launchpad.net/bugs/1783438

Title:
  Release Upgrader unable to determine upgrade

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

Bug description:
  I previously submitted https://bugs.launchpad.net/ubuntu/+source
  /ubuntu-release-upgrader/+bug/1782849 and was advised by
  https://launchpad.net/~brian-murray that bug was a duplicate of
  https://bugs.launchpad.net/bugs/1069133 and that the reason I was
  experiencing the issue was because I was using the oibaf PPA that
  includes drivers that have higher version numbers than those provided
  by the upgrade.

  I purged the oibaf PPA from my system and downgraded drivers, however
  I'm still experiencing the same problem. The upgrade won't work
  because it's unable to determine the upgrade. Can someone please let
  me know exactly which repos I need to re-enable and purge so I can get
  this update sorted. Thanks in advance.

  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: Tue Jul 24 20:06:26 2018
  InstallationDate: Installed on 2017-11-08 (258 days ago)
  InstallationMedia: Kubuntu 17.10 "Artful Aardvark" - Release amd64 (20171017.1)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  UpgradeStatus: Upgraded to artful on 2018-07-25 (0 days ago)
  VarLogDistupgradeTermlog:

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