1:45.8.0-3~deb8u1) is not available, but a newer one is (1:52.8.0-1~deb8u1). We redirected you there.
/etc/apt/apt.conf.d/70debconf is in debconf 1.5.51ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | // Pre-configure all packages with debconf before they are installed.
// If you don't like it, comment it out.
DPkg::Pre-Install-Pkgs {"/usr/sbin/dpkg-preconfigure --apt || true";};
|