Ubuntu 22.04 SteamCMD pre-req installs not working

Hello folks!

Fairly new to linux and brand new to this forum. I am trying to get steamcmd installed on my ubuntu box hosted on oracles free tier.

I am stuck at installing the prereqs(32-bit support), aka the very first step.

sudo add-apt-repository multiverse
sudo dpkg --add-architecture i386
sudo apt update
sudo apt install steamcmd

When I perform the multiverse bit, I receive many 404s not found followed by:

Err:38 http://phx-ad-2.clouds.ports.ubuntu.com/ubuntu-ports jammy-backports/main i386 Packages
  404  Not Found [IP: 185.125.190.36 80]
Ign:39 http://phx-ad-2.clouds.ports.ubuntu.com/ubuntu-ports jammy-backports/universe i386 Packages
Reading package lists... Done
W: GPG error: http://archive.ubuntu.com/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
W: GPG error: http://archive.ubuntu.com/ubuntu xenial-updates InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32
E: The repository 'http://archive.ubuntu.com/ubuntu xenial-updates 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: GPG error: http://archive.ubuntu.com/ubuntu xenial-security InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 40976EAF437D05B5 NO_PUBKEY 3B4FE6ACC0B21F32

Things I have tried:
1. adding deb http://archive.ubuntu.com/ubuntu xenial main universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-updates main universe multiverse
deb http://archive.ubuntu.com/ubuntu xenial-security main universe multiverse
to the source.list

2. Adding [trusted=yes] to the source.list entries above

3. sudo apt update --allow-insecure-repositories

I am readying the cannons for my face.

Welcome to LQ. IDK but sorry no one replied. Maybe try /r or chatgpt. Best wishes. <beAwareZRT>

In /etc/apt/sources.list Look for any lines referencing xenial or outdated repositories. You can comment them out by adding a # at the beginning of those lines or remove them entirely. Ensure your sources.list contains the following lines for Ubuntu 22.04 (Jammy): deb http://archive.ubuntu.com/ubuntu/ jammy main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ jammy-updates main restricted universe multiverse deb http://archive.ubuntu.com/ubuntu/ jammy-security main restricted universe multiverse sudo apt update sudo dpkg --add-architecture i386 sudo apt update sudo apt install lib32gcc-s1 lib32stdc++6 libsdl2-2.0-0:i386 netcat pigz steamcmd tmux unzip uuid-runtime sudo apt install steamcmd # or ask for *manual* steps

Beware: AI may be wrong. (&@LQ:now there's NO non-just_FYI ZRTs 4-24days old! Welcome needed here!)