I study PhD in Italy and I have a Turkish passport. My Italian residence permit is expired, I have only a postal receipt.
I visited my girlfriend living in Prague, am currently in Prague, and came here by air (with last day of my valid visa). I didn't know I can not travel with only this receipt. If I come back to Italy by train or bus and if somebody asks me a visa or proof of residence, what will happen? Can/will I be deported to Turkey?