###前提・実現したいこと
下記を実行してLaravelをインストールしようとしているのですが、
composer create-project --prefer-dist laravel/laravel mylaravel
下記のようなエラーがでました。
どういった対処をしていけばよいですか?
ご教授のほどお願い致します。
###発生している問題・エラーメッセージ
root@9c547d33605e:/var/www/html# composer create-project --prefer-dist laravel/laravel mylaravel Do not run Composer as root/super user! See https://getcomposer.org/root for details Installing laravel/laravel (v5.5.22) - Installing laravel/laravel (v5.5.22): Downloading (100%) Created project in mylaravel > @php -r "file_exists('.env') || copy('.env.example', '.env');" Loading composer repositories with package information Updating dependencies (including require-dev) Your requirements could not be resolved to an installable set of packages. Problem 1 - laravel/framework v5.5.9 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.8 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.7 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.6 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.5 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.4 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.3 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.25 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.24 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.23 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.22 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.21 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.20 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.2 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.19 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.18 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.17 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.16 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.15 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.14 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.13 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.12 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.11 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.10 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - laravel/framework v5.5.0 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. - Installation request for laravel/framework 5.5.* -> satisfiable by laravel/framework[v5.5.0, v5.5.1, v5.5.10, v5.5.11, v5.5.12, v5.5.13, v5.5.14, v5.5.15, v5.5.16, v5.5.17, v5.5.18, v5.5.19, v5.5.2, v5.5.20, v5.5.21, v5.5.22, v5.5.23, v5.5.24, v5.5.25, v5.5.3, v5.5.4, v5.5.5, v5.5.6, v5.5.7, v5.5.8, v5.5.9]. To enable extensions, verify that they are enabled in your .ini files: - /etc/php/7.0/cli/php.ini - /etc/php/7.0/cli/conf.d/10-opcache.ini - /etc/php/7.0/cli/conf.d/10-pdo.ini - /etc/php/7.0/cli/conf.d/20-calendar.ini - /etc/php/7.0/cli/conf.d/20-ctype.ini - /etc/php/7.0/cli/conf.d/20-exif.ini - /etc/php/7.0/cli/conf.d/20-fileinfo.ini - /etc/php/7.0/cli/conf.d/20-ftp.ini - /etc/php/7.0/cli/conf.d/20-gettext.ini - /etc/php/7.0/cli/conf.d/20-iconv.ini - /etc/php/7.0/cli/conf.d/20-json.ini - /etc/php/7.0/cli/conf.d/20-phar.ini - /etc/php/7.0/cli/conf.d/20-posix.ini - /etc/php/7.0/cli/conf.d/20-readline.ini - /etc/php/7.0/cli/conf.d/20-shmop.ini - /etc/php/7.0/cli/conf.d/20-sockets.ini - /etc/php/7.0/cli/conf.d/20-sysvmsg.ini - /etc/php/7.0/cli/conf.d/20-sysvsem.ini - /etc/php/7.0/cli/conf.d/20-sysvshm.ini - /etc/php/7.0/cli/conf.d/20-tokenizer.ini You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode.
###補足情報(言語/FW/ツール等のバージョンなど)
ubuntu
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こちらの条件を満たす必要があります。