From Pygame.org comments:
0.7.0 doesn't execute without tinkering. The files in /images/portrait/ have upper/lower case problems, "enemy-Ayaka-av.png" is considered a different file from "enemy-ayaka-av.png" in Linux. It's somewhat annoying that the portrait_catalog loads the upper case name while unit_portrait_img loads the lower case name, so I have to make a new copy of that image... It seems copying just that one image makes it work, at least the game play starts correctly.