I'm attempting to install a matrix-synapse home server on Ubuntu 18.04.4 LTS.
sudo apt install matrix-synapse -y fails at "Setting up matrix-synapse-py3 (1.11.1+bionic1) ..."
With the message: Job for matrix-synapse.service failed because of unavailable resources or another system error.
journalctl -xe returns:
matrix-synapse.service: Failed to load environment files: No such file or directory
There are certain prerequisites for installing matrix-synapse like python3, virtualenv, sqlite (if you are using sqlite database).
sudo apt-get install build-essential python3-dev libffi-dev python-pip python-setuptools sqlite3 libssl-dev python-virtualenv libjpeg-dev libxslt1-dev
This command solves your issue.
If you want to install please follow matrix synapse github, or upcloud document on synapse installation. These are quite helpful.