In my case, I installed Simutrans using Ubuntu's "apt-get" package. Therefore, I am not very clear where and how the game was installed. Now, downloaded and extracted the latest version of Simutrans - Simulinux-102-2-2.zip. From this folder, I try running simutrans and nothing happens.
So, I searched the file system for any occurrence of 'simutrans' and noticed that the game is installed in the /usr/games folder and the pack in /usr/share/games folder. I copied the latest copy of the simutrans executable over the file in the /usr/games folder and changed the permissions and owner appropriately. This also did not work.
So what should I do?