Ah one thing, that might need to be changed/updated is the
/var/www/nc/.htaccess, please run:
sudo -u www-data php /var/www/nc/occ maintenance:update:htaccess
Is there some reason why you symlink from /var/www/* to /var/www/nc? Why not just placing the files directly into the latter? I see benefits of symlinking only, if you actually want to preserve the old path, but need a different physical location, but as you want to achieve the opposite… ?