This post can also be found in its entirety on Steam itself here —
https://steamcommunity.com/sharedfiles/filedetails/?id=1545463647
Linux Server Access
Obtain root access to a server running the Linux OS. Knowledge of basic Linux OS server administration best practices is recommended.
Important note: The AAPG Linux Dedicated Server is not compatible with hosting User Generated Content (UGC) from the Steam Workshop.
Install SteamCMD
Follow this guide from Valve to Install SteamCMD on your particular Linux distribution. Read More