You just need to enroll in one course. Heck you can enroll in one, wait til you get your u-pass, and then drop the one course. You'll get dinged for the late-drop fee, but they will send you an email about your u-pass being void and refund your u-pass fee.
And this is how you can get a U-pass for 50 bucks :).
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Yes, you are eligible for an U-Pass, unless it's some off-campus courses.
And this is how you can get a U-pass for 50 bucks :).