Salut,
Job for nginx.service failed because the control process exited with error code.
See "systemctl status nginx.service" and "journalctl -xe" for details.
Est-ce que après l’installation échouée tu pourrais faire un nginx -t ?
Edit: in fact it’s probably the same issue as in Failed to install yunohost manually on Debian Stretch fresh install … I’ll have a look soon™