Happened to me as well when I was trying to do a custom offline install of 16.10 near the existing Windows 10. I told the installer I want Ubuntu on /dev/sdb4 (logical) , and swap on /dev/sda4 (primary). It then failed with exactly the described symptoms.
Happened to me as well when I was trying to do a custom offline install of 16.10 near the existing Windows 10. I told the installer I want Ubuntu on /dev/sdb4 (logical) , and swap on /dev/sda4 (primary). It then failed with exactly the described symptoms.