Debian 10 /etc/apt/sources.list
Debian 10 is now in the archive, yet you may still need to migrate and do testing.
deb http://archive.debian.org/debian buster main contrib non-free
deb-src http://archive.debian.org/debian buster main contrib non-free
deb http://archive.debian.org/debian buster-updates main contrib non-free
deb-src http://archive.debian.org/debian buster-updates main contrib non-free
deb http://archive.debian.org/debian-security/ buster/updates main contrib non-free
deb-src http://archive.debian.org/debian-security/ buster/updates main contrib non-free
If your environment does not have a text editor like vi or nano just do this/use echo:
echo "deb http://archive.debian.org/debian buster main contrib non-free
deb-src http://archive.debian.org/debian buster main contrib non-free
deb http://archive.debian.org/debian buster-updates main contrib non-free
deb-src http://archive.debian.org/debian buster-updates main contrib non-free
deb http://archive.debian.org/debian-security/ buster/updates main contrib non-free
deb-src http://archive.debian.org/debian-security/ buster/updates main contrib non-free" > /etc/apt/sources.list
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