From Uppsala city centre, it is convenient to take one of the Uppsala local buses (UL). The stop is called Campus Ultuna.
Busses that stop at Campus Ultuna: 4, 12, 101
Other options: 8 (stops at Ulltunaallén). From there, it is a 800m walk (approx. 10 min)
Website: UL
Tickets can be purchased by card on the bus or by using the UL app (can be downloaded via your smart phone).
Please note that you need to purchase a regular ticket (adult). To purchase the student ticket you need to study at least 75% and have a valid student identification from Mecenat, STUK or WeStudent with SL logo.