• Download & extract

wget https://download.nextcloud.com/server/releases/nextcloud-x.x.x.zip
 
sudo unzip nextcloud-x.x.x.zip -d /wherenextcloudwebdirectoryis/html
sudo chown www-data:www-data /wherewebdirectoryis/html/ -R

• Setup MYSQL User/database

sudo mysql
 
create database nextcloud;
create user nextcloud@localhost identified by 'password';
grant all privileges on nextcloud.* to nextclouduser@localhost identified by 'Password';
flush privileges;
exit;

• Create an Nginx Config File for Nextcloud

server {
    listen 80;
    listen [::]:80;
    server_name example.com; #CHANGE THIS
 
    # Add headers to serve security related headers
    add_header X-Content-Type-Options nosniff;
    add_header X-XSS-Protection "1; mode=block";
    add_header X-Robots-Tag none;
    add_header X-Download-Options noopen;
    add_header X-Permitted-Cross-Domain-Policies none;
    add_header Referrer-Policy no-referrer;
 
    #I found this header is needed on Ubuntu, but not on Arch Linux.
    add_header X-Frame-Options "SAMEORIGIN";
 
    # Path to the root of your installation
    root /whereyourwebdirctoryis/html/nextcloud; #CHANGE THIS
 
    access_log /var/log/nginx/nextcloud.access;
    error_log /var/log/nginx/nextcloud.error;
 
    location = /robots.txt {
        allow all;
        log_not_found off;
        access_log off;
    }
 
    # The following 2 rules are only needed for the user_webfinger app.
    # Uncomment it if you're planning to use this app.
    #rewrite ^/.well-known/host-meta /public.php?service=host-meta last;
    #rewrite ^/.well-known/host-meta.json /public.php?service=host-meta-json
    # last;
 
    location = /.well-known/carddav {
        return 301 $scheme://$host/remote.php/dav;
    }
    location = /.well-known/caldav {
       return 301 $scheme://$host/remote.php/dav;
    }
 
    location ~ /.well-known/acme-challenge {
      allow all;
    }
 
    # set max upload size
    client_max_body_size 1024M;
    fastcgi_buffers 64 4K;
 
    # Disable gzip to avoid the removal of the ETag header
    gzip off;
 
    # Uncomment if your server is build with the ngx_pagespeed module
    # This module is currently not supported.
    #pagespeed off;
 
    error_page 403 /core/templates/403.php;
    error_page 404 /core/templates/404.php;
 
    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/.+|ocs-provider/.+|core/templates/40[34])\.php(?:$|/) {
       include fastcgi_params;
       fastcgi_split_path_info ^(.+\.php)(/.*)$;
       try_files $fastcgi_script_name =404;
       fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
       fastcgi_param PATH_INFO $fastcgi_path_info;
       #Avoid sending the security headers twice
       fastcgi_param modHeadersAvailable true;
       fastcgi_param front_controller_active true;
       fastcgi_pass unix:/run/php/php7.4-fpm.sock;
       fastcgi_intercept_errors on;
       fastcgi_request_buffering off;
    }
 
    location ~ ^/(?:updater|ocs-provider)(?:$|/) {
       try_files $uri/ =404;
       index index.php;
    }
 
    # Adding the cache control header for js and css files
    # Make sure it is BELOW the PHP block
    location ~* \.(?:css|js)$ {
        try_files $uri /index.php$uri$is_args$args;
        add_header Cache-Control "public, max-age=7200";
        # Add headers to serve security related headers (It is intended to
        # have those duplicated to the ones above)
        add_header X-Content-Type-Options nosniff;
        add_header X-XSS-Protection "1; mode=block";
        add_header X-Robots-Tag none;
        add_header X-Download-Options noopen;
        add_header X-Permitted-Cross-Domain-Policies none;
        add_header Referrer-Policy no-referrer;
        # Optional: Don't log access to assets
        access_log off;
   }
 
   location ~* \.(?:svg|gif|png|html|ttf|woff|ico|jpg|jpeg)$ {
        try_files $uri /index.php$uri$is_args$args;
        # Optional: Don't log access to other assets
        access_log off;
   }
}

• Test and reload Nginx

sudo nginx -t
sudo systemctl reload nginx

• Install and enable PHP modules

sudo apt install php-imagick php7.4-common php7.4-mysql php7.4-fpm php7.4-gd php7.4-json php7.4-curl  php7.4-zip php7.4-xml php7.4-mbstring php7.4-bz2 php7.4-intl

• Run Certbot

sudo certbot --nginx

• Make the data directory

sudo mkdir /whereyourwebdirectoryis/nextcloud-data
 
sudo chown www-data:www-data whereyourwebdirectoryis/nextcloud-data

Run setup

• Go to your domain name and run it from there

• Edit www.conf file and remove semi-colon from this line - ;clear_env = no
• Install Redis Cache

sudo apt install redis-server
sudo systemctl start redis-server
sudo systemctl enable redis-server
sudo apt install php-redis

• Add this to THE end of Nextcloud config config.php fund in nextcloud webdirectory/config.php

'memcache.distributed' => '\OC\Memcache\Redis',
'memcache.local' => '\OC\Memcache\Redis',
'memcache.locking' => '\OC\Memcache\Redis',
'redis' => array(
     'host' => 'localhost',
     'port' => 6379,
     ),

• Restart Nginx and PHP

sudo systemctl restart nginx php7.4-fpm

For more information go to https://www.linuxbabe.com/ubuntu/install-nextcloud-ubuntu-20-04-nginx-lemp-stack