Uplay either cant be found or is unable to connect to the internet and doesnt work. As mentioned in comments below, install with Wine by typing the following into your terminal (check your path first): WINEPREFIX="/home/NAME/.steam/steam/steamapps/compatdata/965310/pfx" wine "/home/NAME/.steam/steam/steamapps/common/The Settlers - Rise of an Empire - History Edition/Data/Support/UplayInstaller.exe"

Fps skyrockets, to prevent this use Mangohood or whatever cap program you prefer (setting fps_max in launch options did not work)