With the 1.2.31 update on Friday, a few linux users reported difficulty getting Steam to install the update. Steam reports a "disk write error." This error occurred because the build included a symlink file 'mcs' that points to a non-existent file. In actual fact, the symbolic link doesn't matter to Stardew Valley - the game overwrites the link and points it to the correct file when you start it. The error occurs because Steam attempts to read the file, presumably to verify that it was written correctly, and fails. How to fix your install The 1.2.32 patch has removed the symlink from the depot. Letting steam update your game should fix it. If the error still occurs while installing the update, uninstalling and then reinstalling the game will resolve it.