You should still be able to install it without internet or broken installer but apt will point to the CD only. I think it will get confused in some locales because the installer defaults the mirror and in some countries, this fails.
There is an issue with Debian Live which we use for the installer. Debian moved to using debian deb822 format for sources. This places the sources in /etc/apt/sources.list.d/debian.sources instead of /etc/apt/sources.list
Debian live has not caught up with this change.
so assuming you do get a bootable system, what does
cat /etc/apt/sources.list display? is it just the CD or DVD?
You could create Debian.sources in the folder above that contains
Code:
Types: deb deb-src
URIs: http://deb.debian.org/debian
Suites: trixie trixie-updates
Components: main contrib non-free non-free-firmware non-free
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
Types: deb deb-src
URIs: http://security.debian.org/debian-security
Suites: trixie-security
Components: main contrib non-free non-free-firmware non-free
Signed-By: /usr/share/keyrings/debian-archive-keyring.gpg
Then delete /etc/apt/sources.list
and then type sudo apt update