# 1. Add the repository key
wget -O - -q https://apt.tasemnice.eu/key.gpg | sudo apt-key add -v -

# 2. Add the lorris repository
echo deb http://apt.tasemnice.eu/ubuntu stable main | sudo tee /etc/apt/sources.list.d/lorris.list

# 3. Update packages and install
sudo apt-get update && sudo apt-get install lorris

Index of /ubuntu/pool-bak/dists/

../
artful/                                            05-Jul-2019 17:44                   -
bionic/                                            05-Jul-2019 17:47                   -
stable/                                            05-Jul-2019 17:47                   -
trusty/                                            05-Jul-2019 17:37                   -
xenial/                                            05-Jul-2019 17:40                   -