I have attached screenshots of what the repositories look like. When I run apt update && apt dist-upgrade I get:
Ign:1
http://security.debian.org buster/updates InRelease
Err:2
http://security.debian.org buster/updates Release
404 Not Found [IP: 151.101.194.132 80]
Ign:3
http://ftp.us.debian.org/debian buster InRelease
Ign:4
http://ftp.us.debian.org/debian buster-updates InRelease
Err:5
http://ftp.us.debian.org/debian buster Release
404 Not Found [IP: 64.50.236.52 80]
Err:6
http://ftp.us.debian.org/debian buster-updates Release
404 Not Found [IP: 64.50.236.52 80]
Get:7
http://archive.proxmox.com/debian/pve buster InRelease [3,480 B]
Err:7
http://archive.proxmox.com/debian/pve buster InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7BF2812E8A6E88E0
Reading package lists... Done
E: The repository '
http://security.debian.org buster/updates 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 '
http://ftp.us.debian.org/debian buster 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 '
http://ftp.us.debian.org/debian buster-updates 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:
http://archive.proxmox.com/debian/pve buster InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 7BF2812E8A6E88E0
E: The repository '
http://archive.proxmox.com/debian/pve 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.
W: Target Packages (pve-no-subscription/binary-amd64/Packages) is configured multiple times in /etc/apt/sources.list:9 and /etc/apt/sources.list.d/pve-nosubscription.list:1
W: Target Packages (pve-no-subscription/binary-all/Packages) is configured multiple times in /etc/apt/sources.list:9 and /etc/apt/sources.list.d/pve-nosubscription.list:1
W: Target Translations (pve-no-subscription/i18n/Translation-en_US) is configured multiple times in /etc/apt/sources.list:9 and /etc/apt/sources.list.d/pve-nosubscription.list:1
W: Target Translations (pve-no-subscription/i18n/Translation-en) is configured multiple times in /etc/apt/sources.list:9 and /etc/apt/sources.list.d/pve-nosubscription.list:1