Get your landlord to clean and, if appropriate, replace the lint-filled flexible duct that connects the dryer to the wall-socket for ventilation. It's most likely clogged badly.
Or, do it yourself and tell no one; until people discover it works, you'll have the now-more-desireable dryer to yourself.
Oh, and the thing should be metal that flexes and extends like a bendy-straw. If it's plastic or foil-like material, it's a firehazard. In my state, it's illegal to use the plastic kind with new installs.
we don't use ours because no matter what position the knob is in the setting is "RUN FOR TWO HOURS WITH NO APPRECIABLE DIFFERENCE IN MOISTURE AT THE END"