The name of one of Jupiter's moon that is thought to be able to sustain life is Europa. Europa is thought to have a liquid salty water ocean beneath the ice cover on the top and even though there's little to no volcanic activity chances are that if it is able to harbor the needed chemical building blocks as well as the right proportion of elements so that it can provide the needed amount of energy for biological systems, then life is possible, at least on the most primitive level.
