Comment 2 for bug 1777474

Assigning to debian-installer for now -- this might be an issue where ca-certificates is missing (since it needs to be there before you go get it from an https mirror, hopefully).

That said, is this issue reproducible using the standard iso image; the one available on http://cdimage.ubuntu.com/releases/bionic/release/ubuntu-18.04-server-amd64.iso ?