Well, I installed version 2.2.1 and copied content of directory /home/.ufoai/2.2 to directory /home/.ufoai/2.2.1 . The game normally starts and I am able to load a saved game. All seems to be ok, only research state of the art changed a lot. Some new research proposals appeared (with date '0 Jan 00' and no text in it) and some new technologies are ready to be researched. I'm afraid of corruption of saved games, so I rather return to previous version...