[TomL.]

I wouldn't recommend using such an old OS with an Game Server Panel like OGP but anyway clean up the mess by deleting both meta and sourcemod.
Use the terminal and root user (or sudo) to execute

Originally Posted by TomL. add-apt-repository multiverse dpkg --add-architecture i386 apt-get update apt-get install lib32gcc1 lib32stdc++6

After that you download meta and sourcemod again and upload them to the game server directory using the linux user that owns the server directory. No further steps like messing with files or permissions manually should be required. If you still can't get it to work and want me to take a look just send me a PM with your contact details.