ubuntu20.04.1に「Invoice Ninja」をインストールする

Trying to access array offset on value of type int

sudo apt install software-properties-common
sudo add-apt-repository ppa:ondrej/php

sudo apt install nginx mysql-server php7.3-fpm php7.3-cli php7.3-common php7.3-curl php7.3-gd php7.3-mysql php7.3-xml php7.3-mbstring

sudo mysql_secure_installation

Press y|Y for Yes, any other key for No: n
Please set the password for root here.

New password:

Re-enter new password:

sudo mysql -u root -p

//DB作成
mysql> CREATE SCHEMA `ninja` DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;

//ユーザー作成
mysql> CREATE USER 'ninja'@'%' IDENTIFIED BY 'password';

//認証方式をmysql_native_passwordに変更
mysql> ALTER USER 'ninja'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

//DBへのアクセス権を設定
mysql> GRANT ALL PRIVILEGES ON ninja.* TO 'ninja'@'%' WITH GRANT OPTION;

//GRANTテーブルから再読込
mysql> FLUSH PRIVILEGES;

//抜ける
mysql> \q

wget https://download.invoiceninja.com/ -O /tmp/invoice-ninja.zip

sudo unzip /tmp/invoice-ninja.zip -d /var/www/html/

sudo chown -R www-data: /var/www/html/ninja

sudo nano /etc/nginx/sites-available/ip_or_domain.conf

server {
    listen 80 default_server;
    server_name 10.10.10.100;

    root /var/www/html/ninja/public;

    index index.php;

    charset utf-8;

    location / {
        try_files $uri $uri/ /index.php?$query_string;
    }

    location = /favicon.ico { access_log off; log_not_found off; }
    location = /robots.txt  { access_log off; log_not_found off; }

    access_log  /var/log/nginx/10.10.10.100.access.log;
    error_log   /var/log/nginx/10.10.10.100.error.log;

    sendfile off;

    location ~ \.php$ {
        fastcgi_split_path_info ^(.+\.php)(/.+)$;
        fastcgi_pass unix:/var/run/php/php7.3-fpm.sock;
        fastcgi_index index.php;
        include fastcgi_params;
        fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
        fastcgi_intercept_errors off;
        fastcgi_buffer_size 16k;
        fastcgi_buffers 4 16k;
    }

    location ~ /\.ht {
       deny all;
    }
}

sudo nano /etc/nginx/sites-available/default

<編集>
server {
        listen 81 default_server;　→　81番に変更

sudo ln -s /etc/nginx/sites-available/ip_or_domain.conf /etc/nginx/sites-enabled/ip_or_domain.conf

sudo service nginx restart