Patrick, this repo specified in security-misc installation section, but repo does not work. I thought you were testing transition to debian trixie security-misc: Enhance Miscellaneous Security Settings
5. Add Kicksecure APT repository.
echo "deb [signed-by=/usr/share/keyrings/derivative.asc] https://deb.kicksecure.com trixie main contrib non-free" | sudo tee /etc/apt/sources.list.d/derivative.list
https://deb.kicksecure.com trixie Release
404 Not Found