The webpage cannot be opened when wordpress is installed-debugging method (not finished yet)

I use ubuntu20.04, and the relevant php dependency package is 7.4

The php dependency package I installed is as follows:
root@Desktop:/home/appleyuchi# dpkg --list|grep php

Dependent package name	version number	Supported hardware architecture	Dependent package description
php-common	2:75	all	Common files for PHP packages
php-fpm	2:7.4+75	all	server-side, HTML-embedded scripting language (FPM-CGI binary) (default)
php-gd	2:7.4+75	all	GD module for PHP [default]
php-mysql	2:7.4+75	all	MySQL module for PHP [default]
php7.4-cli	7.4.3-4ubuntu2.3	amd64	command-line interpreter for the PHP scripting language
php7.4-common	7.4.3-4ubuntu2.3	amd64	documentation, examples and common module for PHP
php7.4-fpm	7.4.3-4ubuntu2.3	amd64	server-side, HTML-embedded scripting language (FPM-CGI binary)
php7.4-gd	7.4.3-4ubuntu2.3	amd64	GD module for PHP
php7.4-json	7.4.3-4ubuntu2.3	amd64	JSON module for PHP
php7.4-mysql	7.4.3-4ubuntu2.3	amd64	MySQL module for PHP
php7.4-opcache	7.4.3-4ubuntu2.3	amd64	Zend OpCache module for PHP
php7.4-readline	7.4.3-4ubuntu2.3	amd64	readline module for PHP

So different ubuntu has different php dependency package versions, don't copy mine, make corresponding modifications according to your own version number

Browser access	Webpage error	/etc/nginx/error.log reports an error	solution
http://localhost:80/wp-admin/install.php	502	connect() to unix:/var/run/php/php7.1-fpm.sock failed (2: No such file or directory)	/var/run/php/php7.1-fpm.sock in nginx.conf;/var/run/php/php7.4-fpm.sock and then nginx -s reload
After logging in	404	[error] 500558#500558: *127 “/usr/share/nginx/html/wp-admin/index.php” is not found (2: No such file or directory), client: 127.0.0.1, server: localhost, request: “GET /wp-admin/ HTTP/1.1”, host: “localhost”, referrer: “http://localhost/wp-login.php”

Do you need a compiled version of nginx?
In addition, there are bloggers on the Internet that they need to compile nginx by themselves.
This is available or not, we just use our own.

File Structure
(Python3.6) appleyuchi @ Desktop: ~ / LS WordPress $
hello.php WP-ADMIN cron.php WP-WP-settings.php
...
...

nginx file
corresponds to the complete /etc/nginx/nginx.conf

server {
    
    
            listen 80;
            listen [::]:80;
            server_name localhost;

            root /home/appleyuchi/wordpress;
            #location / 
            #{
    
    
            #try_files $uri $uri/ /index.php?$query_string;
            #}

            index index.php index.html index.htm;

            location / {
    
    
              
                try_files $uri $uri/ /index.php?q=$uri&$args;
               }


            location ~ \.php$ 
            {
    
    
            try_files $uri  =404;
            fastcgi_split_path_info ^(.+\.php)(/.+)$;
            fastcgi_pass unix:/var/run/php/php7.4-fpm.sock;
            fastcgi_index index.php;
            fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
            include fastcgi_params;
            }
            
         	#location /wp-includes {
    
    
        	#root /home/appleyuchi/wordpress/wp-includes;
        	#autoindex on;
            # }
        }