The command sudo systemctl disable lighttpd will disable the lighttpd service, as Pi-hole v6 now uses a built in web server instead of lighttpd. Disabling it will cause less conflict with pihole-FTL.
Since you disabled lighttpd after the update was finished FTL may have used port 8080, you can try accessing the web interface at http://192.168.1.152:8080/admin.
If this still doesnt work please post your debug log link after running sudo pihole -d