# 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/

../
bionic/                                            11-Jun-2020 21:08                   -
eoan/                                              11-Jun-2020 21:11                   -
focal/                                             11-Jun-2020 21:02                   -
stable/                                            11-Jun-2020 21:02                   -
xenial/                                            11-Jun-2020 21:04                   -