Please also update http://archive.ubuntu.com/ubuntu/dists/xenial-proposed/main/installer-amd64/current/images/cdrom/debian-cd_info.tar.gz or something like for this issue on xenial.
Please also update http:// archive. ubuntu. com/ubuntu/ dists/xenial- proposed/ main/installer- amd64/current/ images/ cdrom/debian- cd_info. tar.gz or something like for this issue on xenial.