linux mintのlaravelをインスタントメッセージ

Question

私はlaravelとmintの新しいものです。私はちょうど何かが起こっているものを取得するcn't。私は実際に猿のようにいくつかの答えが必要です。だから私はどのような質問を受け入れることになりますどのような助けもありがとう。

Your requirements could not be resolved to an installable set of packages. 

    Problem 1 
    - laravel/framework v5.4.9 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.8 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.7 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.6 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.5 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.4 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.3 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.25 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.24 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.23 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.22 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.21 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.20 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.2 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.19 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.18 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.17 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.16 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.15 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.14 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.13 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.12 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.11 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.10 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.1 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - laravel/framework v5.4.0 requires ext-mbstring * -> the requested PHP extension mbstring is missing from your system. 
    - Installation request for laravel/framework 5.4.* -> satisfiable by laravel/framework[v5.4.0, v5.4.1, v5.4.10, v5.4.11, v5.4.12, v5.4.13, v5.4.14, v5.4.15, v5.4.16, v5.4.17, v5.4.18, v5.4.19, v5.4.2, v5.4.20, v5.4.21, v5.4.22, v5.4.23, v5.4.24, v5.4.25, v5.4.3, v5.4.4, v5.4.5, v5.4.6, v5.4.7, v5.4.8, v5.4.9]. 

    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/15-xml.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-dom.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-gmp.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-mcrypt.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-simplexml.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 
    - /etc/php/7.0/cli/conf.d/20-wddx.ini 
    - /etc/php/7.0/cli/conf.d/20-xmlreader.ini 
    - /etc/php/7.0/cli/conf.d/20-xmlwriter.ini 
    - /etc/php/7.0/cli/conf.d/20-xsl.ini 
    You can also run `php --ini` inside terminal to see which files are used by PHP in CLI mode. 

Answer 1

PHPでmbstring拡張機能が不足しています。私はミントの傾向や他のいくつかのパッケージマネージャを使用している場合はわからないんだけど、購入してみてください：

sudo apt-get install php7.0-mbstring 

と

phpenmod mbstring 

あなたのPHPのバージョンを一致させるために、これらのコマンドで遊んでする必要がありますが、ということあなたを始めなければなりません。