Installing LibreNMS on Ubuntu 20.04 with NGINX, getting "502 Bad Gateway" in the Web Installer step

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Good morning. Someone had a similar issue not long ago…It looks like you may have missed a few steps:
In /etc/php/7.4/fpm/pool.d - do you have a librenms.conf file? If not, do the following.

cp /etc/php/7.4/fpm/pool.d/www.conf /etc/php/7.4/fpm/pool.d/librenms.conf
vi /etc/php/7.4/fpm/pool.d/librenms.conf

CentOS 8 Debian 10

# Change "www" to "librenms"
[librenms]

# Change user and group to "librenms"
user = librenms
group = librenms

# Change listen to a unique name
listen = /run/php-fpm-librenms.sock

next, do the configuration for the web server:

vi /etc/nginx/conf.d/librenms.conf
```server {
 listen      80;
 server_name librenms.example.com;
 root        /opt/librenms/html;
 index       index.php;

 charset utf-8;
 gzip on;
 gzip_types text/css application/javascript text/javascript application/x-javascript image/svg+xml text/plain text/xsd text/xsl text/xml image/x-icon;
 location / {
  try_files $uri $uri/ /index.php?$query_string;
 }
 location ~ [^/]\.php(/|$) {
  fastcgi_pass unix:/run/php-fpm-librenms.sock;
  fastcgi_split_path_info ^(.+\.php)(/.+)$;
  include fastcgi.conf;
 }
 location ~ /\.(?!well-known).* {
  deny all;
 }
}

rm /etc/nginx/sites-enabled/default
systemctl restart nginx
systemctl restart php7.4-fpm