This question already has an answer here:
I recently got Linux, and wanted to run the game dwarf fortress in my USB flash drive. To run dwarf fortress on Linux you have to use ./df in the dwarf fortress folder, but when I use this command it says:
bash: ./df: Permission denied.
This happened a while ago when I wanted to run it in my NTFS partition, but I fixed it (I don't remember how.)
I would like to fix this, thank you.