If the game won't start, navigate to /home/"user"/GOG Games/Shadow Warrior Classic Complete/support folder and make a backup before you edit the gog_com.shlib file. Search for the dosbox section and delete the ./dosbox/ part from one of the lines to look like this: dosbox -conf "${conf_1}" -conf "${conf_2}" -no-console -c exit Next install dosbox with your package manager or in terminal. Now the game should start without issues.
