Can't update Steam games, due to "corrupt update files"
Solution 1:
There seems to be a problem with installing a game on a ntfs-partition with Steam on Linux. Try to mount your ntfs partition with these options in your /etc/fstab file:
defaults,exec,uid=1000,gid=1000
Solution from here: https://github.com/ValveSoftware/steam-for-linux/issues/4800