Hello. I have the same behavior with Debian Testing (SparkyLinux)
systemd[1]: apt-cacher-ng.service: Main process exited, code=exited, status=1/FAILURE
systemd[1]: Failed to start Apt-Cacher NG software download proxy.I tried with versions: 0.8.0-3, 0.8.8-1~bpo8+1, 0.8.9-1, 0.9.0-1 and always the same.
Erasing cache folder doesn't work for me as well trying to start manually the daemon.
Please, let me know how can help you find the problem. -- Miguel DellDor