Dear Andrew,
Thank you for taking up packaging of matrix-synapse. Dependencies for matrix-synapse seems to be mostly packaged by you. Sunil and I, contributors to the FreedomBox, are interested in helping out with the packaging effort of matrix-synapse server. Could you please let know if you have source repository for the Debian packaging work you are doing? We could help by testing and submitting patches. So far, we found out-of-debian packaging effort to have progressed significantly: https://github.com/matrix-org/package-synapse-debian -- Regards, Rahul Dé