laravel installation error in ubuntu 16.04
<p>I am having trouble while installation error in laravel.
First install xampp in ubuntu 16.04.
After that </p>

<pre><code>cd /opt/lampp/htdocs/
composer create-project --prefer-dist laravel/laravel blog
</code></pre>

<p>installation laravel with composer some error occurs</p>

<pre><code>E: Package 'php5-mcrypt' has no installation candidate
shwekayin@shwekayin-VirtualBox:/opt/lampp/htdocs$ composer create-project --prefer-dist laravel/laravel blog1
Installing laravel/laravel (v5.3.0)
  - Installing laravel/laravel (v5.3.0)
    Loading from cache

Created project in blog1
&gt; 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 v5.3.4 requires ext-mbstring * -&gt; the requested PHP extension mbstring is missing from your system.
    - laravel/framework v5.3.3 requires ext-mbstring * -&gt; the requested PHP extension mbstring is missing from your system.
    - laravel/framework v5.3.2 requires ext-mbstring * -&gt; the requested PHP extension mbstring is missing from your system.
    - laravel/framework v5.3.1 requires ext-mbstring * -&gt; the requested PHP extension mbstring is missing from your system.
    - laravel/framework v5.3.0 requires ext-mbstring * -&gt; the requested PHP extension mbstring is missing from your system.
    - Installation request for laravel/framework 5.3.* -&gt; satisfiable by laravel/framework[v5.3.0, v5.3.1, v5.3.2, v5.3.3, v5.3.4].

  To enable extensions, verify that they are enabled in those .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.
</code></pre>

<p>How can I fix this error. My xampp php version is 7.0.10</p>