さくらvpsでlaravelの初期画面を表示させたい。

前提・実現したいこと

cd /var/www/htmlにlaravelのプロジェクトを作成し、laravelの初期画面を表示したい。
現在、http://ipアドレス/プロジェクト名/public/を検索してもHTTPエラー500がでている。
http://ipアドレス/プロジェクト名で検索すると、index of　プロジェクト名が表示され、ディレクトリ構成がみれる。
apache,phpはインストール済みです。
cd /var/www/html下に適当に作った、index.phpなどはブラウザから表示できる。

試したこと

.htaccess　の最初の部分をコメントアウトしてみた

<IfModule mod_rewrite.c>
    #<IfModule mod_negotiation.c>
        #Options -MultiViews -Indexes
    #</IfModule>

    RewriteEngine On

    # Handle Authorization Header
    RewriteCond %{HTTP:Authorization} .
    RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

    # Redirect Trailing Slashes If Not A Folder...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_URI} (.+)/$
    RewriteRule ^ %1 [L,R=301]

    # Send Requests To Front Controller...
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteRule ^ index.php [L]
</IfModule>

Laravel new プロジェクト時のエラー

Problem 1
- Installation request for tijsverkoyen/css-to-inline-styles 2.2.2 -> satisfiable by tijsverkoyen/css-to-inline-styles[2.2.2].
- tijsverkoyen/css-to-inline-styles 2.2.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.
Problem 2
- Installation request for phar-io/manifest 1.0.3 -> satisfiable by phar-io/manifest[1.0.3].
- phar-io/manifest 1.0.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
Problem 3
- Installation request for phpunit/php-code-coverage 7.0.10 -> satisfiable by phpunit/php-code-coverage[7.0.10].
- phpunit/php-code-coverage 7.0.10 requires ext-dom * -> the requested PHP extension dom is missing from your system.
Problem 4
- Installation request for phpunit/phpunit 8.5.5 -> satisfiable by phpunit/phpunit[8.5.5].
- phpunit/phpunit 8.5.5 requires ext-dom * -> the requested PHP extension dom is missing from your system.
Problem 5
- Installation request for theseer/tokenizer 1.1.3 -> satisfiable by theseer/tokenizer[1.1.3].
- theseer/tokenizer 1.1.3 requires ext-dom * -> the requested PHP extension dom is missing from your system.
Problem 6
- tijsverkoyen/css-to-inline-styles 2.2.2 requires ext-dom * -> the requested PHP extension dom is missing from your system.
- laravel/framework v7.14.1 requires tijsverkoyen/css-to-inline-styles ^2.2.2 -> satisfiable by tijsverkoyen/css-to-inline-styles[2.2.2].
- Installation request for laravel/framework v7.14.1 -> satisfiable by laravel/framework[v7.14.1].

To enable extensions, verify that they are enabled in your .ini files:
- /etc/php.ini
- /etc/php.d/20-bz2.ini
- /etc/php.d/20-calendar.ini
- /etc/php.d/20-ctype.ini
- /etc/php.d/20-curl.ini
- /etc/php.d/20-exif.ini
- /etc/php.d/20-fileinfo.ini
- /etc/php.d/20-ftp.ini
- /etc/php.d/20-gd.ini
- /etc/php.d/20-gettext.ini
- /etc/php.d/20-iconv.ini
- /etc/php.d/20-json.ini
- /etc/php.d/20-mbstring.ini
- /etc/php.d/20-mysqlnd.ini
- /etc/php.d/20-pdo.ini
- /etc/php.d/20-phar.ini
- /etc/php.d/20-sockets.ini
- /etc/php.d/20-sodium.ini
- /etc/php.d/20-sqlite3.ini
- /etc/php.d/20-tokenizer.ini
- /etc/php.d/30-mysqli.ini
- /etc/php.d/30-pdo_mysql.ini
- /etc/php.d/30-pdo_sqlite.ini
- /etc/php.d/40-zip.ini
You can also run php --ini inside terminal to see which files are used by PHP in CLI mode.