To use this repository, you need to run this to get my GPG key gpg --keyserver keyring.debian.org --recv-keys 900CB024B67931D40F82304BD0178C767D069EE6 gpg -a -o sthibault.asc --export 900CB024B67931D40F82304BD0178C767D069EE6 sudo cp sthibault.asc /etc/apt/keyrings/sthibault.asc and add this to your sources.list: deb [signed-by=/etc/apt/keyrings/sthibault.asc] https://people.debian.org/~sthibault/tmp/experimental ./ and then you can install packages like this: sudo apt update sudo apt install somepackage/experimental-sthibault