Comment 4 for bug 1558261

Can't tell. Sounds pretty far out to me, though. Which variable would affect this adversely in Ubuntu GNOME but not in Ubuntu?

I was able to reproduce the issue with the Ubuntu GNOME ISO by selecting French/Toronto. However, when selecting French as the language, while accepting the suggested time zone location (Stockholm - I'm in Sweden), the window for selecting the keyboard layout worked properly. This indicates that there is some kind of issue with the time zone location Toronto. (Still unclear to me why it only happens with Ubuntu GNOME.)