sudo apt-get update failing | AntiX 19.3 32-bit

[Member HeroRareheart]

I already posted over on the LTT Forums about this and got some assistance, but it didn’t result in any progress. When I run the command “sudo apt-get update” in the terminal I get this output:

$ sudo apt-get update
[sudo] password for HeroRareheart:
Get:1 http://debian.csail.mit.edu/debian buster-updates InRelease [51.9 kB]
Hit:2 http://debian.csail.mit.edu/debian buster InRelease
Ign:3 http://debian.csail.mit.edu/debian/ster main InRelease
Err:4 http://debian.csail.mit.edu/debian/ster main Release
404 Not Found [IP: 128.30.3.141 80]
Hit:5 http://security.debian.org buster/updates InRelease
Ign:6 https://mirrors.evowise.com/mxlinux-packages/antix/buster main InRelease
Get:7 https://mirrors.evowise.com/mxlinux-packages/antix/buster buster InRelease [27.4 kB]
Hit:8 http://deb.debian.org/debian buster-backports InRelease
Err:9 https://mirrors.evowise.com/mxlinux-packages/antix/buster main Release
404 Not Found [IP: 2606:4700:10::6816:5b3 443]
Err:7 https://mirrors.evowise.com/mxlinux-packages/antix/buster buster InRelease
The following signatures were invalid: EXPKEYSIG DB36CDF3452F0C20 antiX (antix repo) <repo@antixlinux.com>
Reading package lists… Done
E: The repository ‘http://debian.csail.mit.edu/debian/ster main Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository ‘https://mirrors.evowise.com/mxlinux-packages/antix/buster main Release’ does not have a Release file.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
W: GPG error: https://mirrors.evowise.com/mxlinux-packages/antix/buster buster InRelease: The following signatures were invalid: EXPKEYSIG DB36CDF3452F0C20 antiX (antix repo) <repo@antixlinux.com>
E: The repository ‘https://mirrors.evowise.com/mxlinux-packages/antix/buster buster InRelease’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.

I can clearly see several errors but I am unsure where to begin with fixing them. I assume the repositories failing to find a release file are just looking in the wrong directory, as manually navigating to it on my web browser I can find a slightly differing directory containing the correct files. I’m unsure how to fix the 404 errors I’m getting or why they are happening and I’m uncertain how to fix the invalid signature issue.

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