do-release-upgrade broke my system 18.04 to 18.10

[Mr Cobalt]

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: