1st of all if your boot partition is full delete some old kernels! 2nd you sound like a noob, so install Linux Mint and don't try advanced install until you know the operating system and partitions better! Just install in one partition and you should be fine! Advance install are for users...
This was madness to begin with. They should have stopped all planes and closed borders when this crap hit Italy. But yea what can I say when it comes to idiots and tyrants!