我开始为我的虚拟环境编写这个shell脚本。我使用的是ubuntu14.04，默认的mysql版本是5.5。我需要MySQL5.7安装，我不知道如何，如果它有可能安装在ubuntu 14.04版本，这是我开始工作，我想知道你是否可以帮我修改这个让它工作的正确方式

# install services and apps

sudo apt-get update
sudo apt-get install -y joe acl git

sudo debconf-set-selections <<< 'mysql-server mysql-server/root_password password vagrant'
sudo debconf-set-selections <<< 'mysql-server mysql-server/root_password_again password vagrant'
sudo apt-get -y install mysql-server mysql-client
sudo apt-get -y install unzip

# install apache

sudo apt-get install -y apache2

# install php 7

sudo add-apt-repository ppa:ondrej/php
sudo apt-get -y update
sudo apt-get -y install php7.0
sudo apt-get -y install php7.0-mysql
sudo apt-get -y install php7.0-mcrypt
sudo apt-get -y install php7.0-mbstring
sudo apt-get -y install php7.0-memcache
sudo apt-get -y install php7.0-xmlrpc
sudo apt-get -y install php7.0-xsl
sudo apt-get -y install libapache2-mod-php7.0
sudo apt-get -y install language-pack-UTF-8
sudo a2enmod php7.0
sudo apt-get -y install php7.0-curl
sudo apt-get -y install php7.0-gd

# set virtualhost file to sites-available and enable site

sudo cp -rf /var/www/vagrant-dependencies/vagrant.conf /etc/apache2/sites-available/000-default.conf
sudo a2enmod rewrite
sudo service apache2 restart
sudo apachectl restart

# create DB

sudo mysql -u root -pvagrant -e "CREATE DATABASE vagrant"