Life is not likely to exist on Jupiter due to many reasons:
1. It is one of the gas giants, mostly made up of gases hydrogen and helium.
The quantity of water and ammonia are present in very small quantities and harbor the basis of terrestrial life is almost missing on Jupiter. These conditions are favorable to any imaginable form of life.
2. As it is so far from the sun the surface temperatures are bound to be too low for life. Going to the interior, the temperatures soar up to something like 20 000 k due to the extreme pressures. Life cannot exist in similar conditions.
3. Jupiter is known as the star that failed to be. If the mass of Jupiter was higher, say including some or all the other planets, it would have been a star.
The facts known about the planets and of life could lead us to the conclusion that even on the terrestrial planets other than the earth life is unlikely to exist as they are too close to the sun and therefore too hot. All the conditions for life as we know it exists on earth only.