I saw your last update.. and you have pretty much figured it out. Looks like a dependency problem for moodlight. But you said you had it installed on PR1.2 erlier so it don't make sense.

I just checked and Moodlight need pygame 1.9.1 and libsdl-ttf2.0 (2.0.9-1).. so uninstalling pygame and libsdl should solve it.