Garry's Mod Server Issue. Help Requested!

Hey guys! I know I dont post much, but anyways…I am running Linux Ubuntu and I have the dedicated server files all downloaded. I am having issues starting the server. I followed this guide (http://wiki.garrysmod.com/?title=Linux_Dedicated_Server_Setup#Optionally_Creating_a_Startup_Script) and cannot get the server to start. I made it so I can run the startgmod.sh as an executable. However, when I use it, it just gives me the echo and then closes after 5 seconds. If you could please help me figure out how to start the server, that would be awesome. Thanks!