[Bug 1801397] [NEW] do-release-upgrade broke my system 18.04 to 18.10

[Mr Cobalt]

Public bug reported:

Sooooo... I went to update my system, and when finished, my system was
kinda broken. I did do-release-upgrade and it upgraded to Cosmic, and
then I realized that some packages I used weren't installed, and they
wouldn't install because other packages were missing. Then, I tried to
go back to Bionic, using this guide here: https://linuxconfig.org/how-
to-downgrade-ubuntu-linux-system-to-its-previous-version, and that broke
it even more. Then I tried fixing my python symlink, and after I fixed
it with python2.7, apt wouldn't work! And now I don't know what to do.
Also, do-release-upgrade won't detect cosmic anymore, so I can't re-
upgrade.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubuntu-release-upgrader-core 1:18.04.17
ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
Uname: Linux 4.18.0-10-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: ubuntu:GNOME
Date: Fri Nov  2 13:37:57 2018
InstallationDate: Installed on 2018-08-17 (77 days ago)
InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: release-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)
VarLogDistupgradeTermlog:

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


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

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https://bugs.launchpad.net/bugs/1801397

Title:
  do-release-upgrade broke my system 18.04 to 18.10

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

Bug description:
  Sooooo... I went to update my system, and when finished, my system was
  kinda broken. I did do-release-upgrade and it upgraded to Cosmic, and
  then I realized that some packages I used weren't installed, and they
  wouldn't install because other packages were missing. Then, I tried to
  go back to Bionic, using this guide here: https://linuxconfig.org/how-
  to-downgrade-ubuntu-linux-system-to-its-previous-version, and that
  broke it even more. Then I tried fixing my python symlink, and after I
  fixed it with python2.7, apt wouldn't work! And now I don't know what
  to do. Also, do-release-upgrade won't detect cosmic anymore, so I
  can't re-upgrade.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: ubuntu-release-upgrader-core 1:18.04.17
  ProcVersionSignature: Ubuntu 4.18.0-10.11-generic 4.18.12
  Uname: Linux 4.18.0-10-generic x86_64
  ApportVersion: 2.20.9-0ubuntu7
  Architecture: amd64
  CrashDB: ubuntu
  CurrentDesktop: ubuntu:GNOME
  Date: Fri Nov  2 13:37:57 2018
  InstallationDate: Installed on 2018-08-17 (77 days ago)
  InstallationMedia: Ubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
  PackageArchitecture: all
  SourcePackage: ubuntu-release-upgrader
  Symptom: release-upgrade
  UpgradeStatus: No upgrade log present (probably fresh install)
  VarLogDistupgradeTermlog:

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