Error: 404 not found

What does it consist?

This error appeared me when I was trying to upgrade an apt package. Trying to upgrade protonvpn package:

sudo apt install network-manager-openvpn network-manager-openvpn-gnome [sudo] contraseña para alan: Installing: network-manager-openvpn network-manager-openvpn-gnome Installing dependencies: easy-rsa libeac3 libpkcs11-helper1t64 opensc opensc-pkcs11 openvpn Paquetes sugeridos: resolvconf openvpn-dco-dkms openvpn-systemd-resolved Summary: Upgrading: 0, Installing: 8, Removing: 0, Not Upgrading: 0 Download size: 292 kB / 2 468 kB Space needed: 9 002 kB / 357 GB available Continue? [S/n] S Err:1 [http://deb.debian.org/debian](http://deb.debian.org/debian) trixie/main amd64 network-manager-openvpn amd64 1.12.0-2 404 Not Found [IP: 199.232.158.132 80] Err:2 [http://deb.debian.org/debian](http://deb.debian.org/debian) trixie/main amd64 network-manager-openvpn-gnome amd64 1.12.0-2 404 Not Found [IP: 199.232.158.132 80] Error: Fallo al obtener [http://deb.debian.org/debian/pool/main/n/network-manager-openvpn/network-manager-openvpn_1.12.0-2_amd64.deb](http://deb.debian.org/debian/pool/main/n/network-manager-openvpn/network-manager-openvpn_1.12.0-2_amd64.deb) 404 Not Found [IP: 199.232.158.132 80] Error: Fallo al obtener [http://deb.debian.org/debian/pool/main/n/network-manager-openvpn/network-manager-openvpn-gnome_1.12.0-2_amd64.deb](http://deb.debian.org/debian/pool/main/n/network-manager-openvpn/network-manager-openvpn-gnome_1.12.0-2_amd64.deb) 404 Not Found [IP: 199.232.158.132 80] Error: No se pudieron obtener algunos archivos, ¿quizás deba ejecutar «apt-get update» o deba intentarlo de nuevo con --fix-missing?

With help from AI I found the solution

You have to remove from /var/lib/apt/lists/ all sources list:

sudo rm -rf /var/lib/apt/lists/*

This will delete all package lists in cache that APT keeps in local storage. After this, you have to run sudo apt update to synchronize the new updates from package source (apt repositories)

After this, I recomend you reboot your system and, then you can try to install that program or package that showed you this kind of error.