Michael "Dauber" Dybinski (Bill Fagerbakke), the special teams coach under Hayden Fox on the Coach TV series, is an ex-player at Minnesota State University and a kind-hearted, naive "dumb jock" whose ongoing joke was that he had not yet graduated from Minnesota State despite being enrolled for several years there. Despite his seemingly simple nature, Dauber would often surprisingly be of intellectual help to the team, usually learned from a class he was attending or because he was a fan of Nova. Dauber would later graduate midway through Coach's third season with three bachelor's degrees in physical education, business administration, and forestry – without even knowing he was eligible for all three until he got his transcript.

I have watched every episode of Coach, and I still wonder how can a student be stuck at a university for more than four years and still not graduate? Was Dauber retained (meaning when you repeat a grade in school) for several years for failing some of his classes or something?

Part of the problem was that Dauber wasn’t real bright and probably failed some classes. He also kept changing his major.

It's actually more common than you might think. Many colleges/universities have students who may take anywhere from 5-6 years. There's even "professional students" who continue their studies [forever] with no declared majors. As long as the school is paid their tuition and fees, they don't seem to care.