A dream in which your uncle is prominently featured has many different interpretations. Depending on the circumstances in the dream as well your interaction with him the interpretations can change quite dramatically.
Simply seeing your (living) uncle in a dream means that financial and material prosperity is ahead in general. Not all of this prosperity will be achieved with your work but rather some of it will be mostly due to luck.
Having a talk with your uncle in the dream is a sign of you needing to be more careful of the moves that you will make in the professional life. There are people that wait for your mistakes and they will take advantage of them gladly.
Dreaming of your uncle being sick or dying in the dream means that you need to be more careful about choosing your friends. Some of the may have a rather hypocritical attitudes and they might not be particularly concerned about your well being.
Dreaming that you uncle has died generally suggest that he will be of very good health and spirits in real life. If he has some health issues a dream like this one can mean that he will get better quite soon.
Dreaming of a dead uncle as if he was alive means that someone very powerful might clash his interests with yours. Be careful of your moves and choose your positions in your professional life very wisely.
If you dream of your uncle arguing with your family it means that relationships within the family will become more harmonious in the near future. Sometimes this dream signifies that any open familial conflicts will become resolved soon.
Arguing and fighting with your uncle in the dream means that your personal life will become less structured and more spontaneous in the next few months. You will learn how set your mind at ease about some issues in your personal life.