Probleme beim Ubuntu-Update (apt-get: 404 Not Found)?

Hallo, würde mich über etwas Unterstützung sehr freuen. Als mittlerer Anfänger in Sachen Shell gelingt es mir leidern nicht mehr, mein Ubuntu auf WSL zu updaten. Ausgabe von

sudo apt-get update
:

Ign:1 http://archive.ubuntu.com/ubuntu main InRelease
Ign:2 http://archive.ubuntu.com/ubuntu -security InRelease
Ign:3 http://archive.ubuntu.com/ubuntu -updates InRelease
...
Ign:60 http://archive.ubuntu.com/ubuntu -updates/multiverse Translation-en_US
Ign:61 http://archive.ubuntu.com/ubuntu -updates/multiverse Translation-en
Err:7 http://archive.ubuntu.com/ubuntu main/restricted Sources
  404  Not Found [IP: 91.189.88.174 80]
Ign:8 http://archive.ubuntu.com/ubuntu main/universe Sources
Ign:9 http://archive.ubuntu.com/ubuntu main/multiverse Sources
...
Ign:52 http://archive.ubuntu.com/ubuntu -updates/restricted Translation-en_US
Reading package lists... Done
W: The repository 'http://archive.ubuntu.com/ubuntu main Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://archive.ubuntu.com/ubuntu -security Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: The repository 'http://archive.ubuntu.com/ubuntu -updates Release' does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/main/restricted/source/Sources  404  Not Found [IP: 91.189.88.174 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/-security/main/source/Sources  404  Not Found [IP: 91.189.88.174 80]
E: Failed to fetch http://archive.ubuntu.com/ubuntu/dists/-updates/main/source/Sources  404  Not Found [IP: 91.189.88.174 80]
E: Some index files failed to download. They have been ignored, or old ones used instead.

Ich habe leider keine Ahnung, wie ich das beheben kann, trotz unzähligen Kommandos, die ich von StackOverflow kopiert habe.

Gibt es irgendeine Möglichkeit, apt einfach komplett zurückzusetzen? Im schlimmsten Fall bin ich auch bereit, alle Packages, die ich hinzuinstalliert habe, zu missen, solange meine Einstellungen nicht verloren gehen. Über jede Hilfe wäre ich sehr dankbar!

PC, Computer, Technik, Linux, Ubuntu, Update, Unix, apt-get
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