Hi. I had the same issue. Here's what I did:
Make the 'Noefeud' file an executable.
Type 'chmod +x Neofeud' (without the the apostraphes!)
Go to the 'data' folder.
'cd data'
Make the files 'ags32' and 'ags64' executable.
type 'chmod +x ags32' and then type 'chmod +x ags 64' (without the the apostraphes!)
Go back to the parent directory where the Neofeud file is. 'cd ..'
and run './Neofeud' (without the the apostraphes!)
If you like you can use an file manager like Nautilus or Dolphin, right click on the file, go to permissions and tick the 'Make executable' box.
Good Luck!