Instructions for bullseye system
Note: You will need bullseye-backports enabled, see backports website for instructions.
Import fasttrack archive keyring:
# apt -t bullseye-backports install fasttrack-archive-keyring
Add following lines to /etc/apt/sources.list on your bullseye system.
deb https://fasttrack.debian.net/debian/ bullseye-fasttrack main contrib
deb https://fasttrack.debian.net/debian/ bullseye-backports main contrib
If you cannot use https in your sources.list, add following.
deb http://fasttrack.debian.net/debian/ bullseye-fasttrack main contrib
deb http://fasttrack.debian.net/debian/ bullseye-backports main contrib