Unfortunately I had to learn this lesson the hard way as well. Steam on Linux does not really work with the games on an NTFS partition. First to confirm this is your issue I would install a game on a partition that is a different format type. The easiest option if it is in fact the issue might be this Hack posted be a reddit user. Otherwise you’ll have to reinstall your games on a compatible partition.
Are you guys using VCR to pirate media or something?