I removed lighttpd completely with above commands.
Dietpi-letsencrypt runs without failures and homepage is back again.
What I did before.I installed :
Radarr
Sonarr
Lidarr
jackett and
transmission.
It was running, I downloaded two movies and some music.
/Tmp was full 100% and caused mistakes (you supposed me in
https://dietpi.com/forum/t/no-space-left-on-device/6175/1)
I removed 5 software with diet-software uninstall
I have an image of SD card, if you want I could try to do it again and see where lighttpd was installed
Thanks for support