ok, lets be sure, you have downloaded MM:S and SM Linux versions, not windows ?
Can you see file
../csgo/addons/metamod/bin/server.so ?
*edit
here is video but about windows version, you just need extract zip files and drag files in server, in right place.
https://www.youtube.com/watch?v=jqnn...bCl09GblHV0pX0
Simple installation
*edit
What are you server launch parameters ?