As first I suggets removing the release entry.
I updated my repo today, so you might have broken entries in your packages list.
If apt-get clean does not work, you can try to remove the lists manually from /var/lib/apt/lists .
You should also try to remove the *.deb-files from /var/cache/apt/archives and all entries from /var/cache/apt/archives/partial
I just updated C::B from my repo (without dbg-packages) and it works as expected.