"greenhouse effect"
irrelevant if there is no local sun.
There's no problem with life on an Europa-like frozen waterworld - once you get deep enough for the ice to thaw, and get the chemical action of submarine volcanoes from an active convecting mantle. Superearths would be ideal for life to develop and there might also be some interesting surface volcanoes/geysers as the "atmospheric" ices got subducted by ice tectonics and warmed up at depth...