Is there any chance you'll also include the source debian mixings into the repository? Also, I am having some problems with apt-get update:
Reading package lists... Done
E: Failed to fetch http://repo.element-networks.nl/dists/custom/Release No Hash entry in Release file /var/lib/apt/lists/partial/repo.element-networks.nl_dists_custom_Release which is considered strong enough for security purposes
E: Some index files failed to download. They have been ignored, or old ones used instead.
root@taz:~/#
I'm using Ubuntu 16.04 LTS 64-bit.