Debian 9.0 DVD-1.iso: No Release file

[Alan Reding <gajuph4pre@yahoo.com>]

Hi,

I downloaded the first DVD of Debian Stretch and installed the OS onto my machine.

After I typed

sudo apt-get update

The following error message appeared:

W: The repository "cdrom://[Debian GNU/Linux 9.0.0 _Stretch_ - Official amd64 DVD Binary-1 20170617-13:08] Stretch Release" does not have a Release file.
N: Data from such a repository can't be authenticated and is therefore potentially dangerous to use.
N: See apt-secure(8) manpage for repository creation and user configuration

I have been using Debian since Wheezy (7.0) and this is the first time I have received such a warning.

Should I inform the Debian Release team? Is it aware of the omission of the Release file?

Regards.

Alan