I managed to reproduce this, although I don't think I was being offered the autoresize option but rather it was trying to install "alongside" the "install" that was on the install media. (certainly, sdb was the install media for me, and I got the same message)
I managed to reproduce this, although I don't think I was being offered the autoresize option but rather it was trying to install "alongside" the "install" that was on the install media. (certainly, sdb was the install media for me, and I got the same message)