Man pages matching name systemd-environment-d-generator in section 8:

systemd-environment-d-generator.8.de	debian 10 / manpages-de
systemd-environment-d-generator.8.en	debian 10 / systemd
systemd-environment-d-generator.8.de	debian 11 / manpages-de
systemd-environment-d-generator.8.en	debian 11 / systemd
systemd-environment-d-generator.8.de	debian 12 / manpages-de
systemd-environment-d-generator.8.en	debian 12 / systemd