Internal Server Error: 404 Not Found

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I finished the internal server setup, and it can run phpinfo.php. I can’t open the website(The issuse is :404 Not Found.), when I added nextcloud.conf and first time run the website.

It is the first time I’ve seen this error,
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Nextcloud version :19.0.0_:
Operating system and version : Ubuntu 18.04
nginx version :1.17.0
PHP version :7.4.7

The issue you are facing:

Is this the first time you’ve seen this error? (Y/N):y

I used nextcloud.conf form https://docs.nextcloud.com/server/19/admin_manual/installation/nginx.html#nextcloud-in-a-subdir-of-the-nginx-webroot:

upstream php-handler {
#server 127.0.0.1:9000;
server unix:/run/php/php7.4-fpm.sock;
}

server {
#listen 80;
#listen [::]:80;
server_name _;
# enforce https
#return 301 https://$server_name:443$request_uri;
}

server {
server_name _;

add_header Referrer-Policy "no-referrer" always;
add_header X-Content-Type-Options "nosniff" always;
add_header X-Download-Options "noopen" always;
add_header X-Frame-Options "SAMEORIGIN" always;
add_header X-Permitted-Cross-Domain-Policies "none" always;
add_header X-Robots-Tag "none" always;
add_header X-XSS-Protection "1; mode=block" always;

# Remove X-Powered-By, which is an information leak
fastcgi_hide_header X-Powered-By;

# Path to the root of your installation
root /var/www/html/nextcloud;

location = /robots.txt {
    allow all;
    log_not_found off;
    access_log off;
}

location = /.well-known/carddav {
  return 301 $scheme://$host:$server_port/remote.php/dav;
}
location = /.well-known/caldav {
  return 301 $scheme://$host:$server_port/remote.php/dav;
}

# set max upload size
client_max_body_size 512M;
fastcgi_buffers 64 4K;

# Enable gzip but do not remove ETag headers
gzip off;


#pagespeed off;

location / {
    rewrite ^ /index.php;
}

location ~ ^\/(?:build|tests|config|lib|3rdparty|templates|data)\/ {
    deny all;
}
location ~ ^\/(?:\.|autotest|occ|issue|indie|db_|console) {
    deny all;
}

location ~ ^\/(?:index|remote|public|cron|core\/ajax\/update|status|ocs\/v[12]|updater\/.+|oc[ms]-provider\/.+|.+\/richdocumentscode\/proxy)\.php(?:$|\/) {
    fastcgi_split_path_info ^(.+?\.php)(\/.*|)$;
    set $path_info $fastcgi_path_info;
    try_files $fastcgi_script_name =404;
    include fastcgi_params;
    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
    fastcgi_param PATH_INFO $path_info;
    fastcgi_param HTTPS on;
    # Avoid sending the security headers twice
    fastcgi_param modHeadersAvailable true;
    # Enable pretty urls
    fastcgi_param front_controller_active true;
    fastcgi_pass php-handler;
    fastcgi_intercept_errors on;
    fastcgi_request_buffering off;
}

location ~ ^\/(?:updater|oc[ms]-provider)(?:$|\/) {
    try_files $uri/ =404;
    index index.php;
}


location ~ \.(?:css|js|woff2?|svg|gif|map)$ {
    try_files $uri /index.php$request_uri;
    add_header Cache-Control "public, max-age=15778463";
    
    add_header Referrer-Policy "no-referrer" always;
    add_header X-Content-Type-Options "nosniff" always;
    add_header X-Download-Options "noopen" always;
    add_header X-Frame-Options "SAMEORIGIN" always;
    add_header X-Permitted-Cross-Domain-Policies "none" always;
    add_header X-Robots-Tag "none" always;
    add_header X-XSS-Protection "1; mode=block" always;

    # Optional: Don't log access to assets
    access_log off;
}

location ~ \.(?:png|html|ttf|ico|jpg|jpeg|bcmap|mp4|webm)$ {
    try_files $uri /index.php$request_uri;
    # Optional: Don't log access to other assets
    access_log off;
}

}

And I set cgi.fix_pathinfo to 1 in php.ini.