After getting the opal helmet, sleeping at Dungars estate, and defeating the assassin, Dungar's wife screams, but when I talk to her, she just says, "Fabulous!" When talking to Dungar, Noslom says ,"Goodbye Dungar. I'm sorry." I am unable to go down the stairs, and when stepping on a certain square next to Dungar's wife, the application closes.
I am running the version from the ubuntu software center.
This is a duplicate of 2796679, and is fixed in SVN, which you can download and compile.