# apt-get update W: Failed to fetch https://homegear.eu/packages/Raspbian/jessie/Packages Hash Sum mismatch E: Some index files failed to download. They have been ignored, or old ones used instead.
rm -rf /var/lib/apt/lists/*
and rebooting did not resolve the hash mismatch issue.
Not sure where to take it from here. Could the issue related to caching of the repo assets?
$ lsb_release -a No LSB modules are available. Distributor ID: Raspbian Description: Raspbian GNU/Linux 8.0 (jessie) Release: 8.0 Codename: jessie