MYSQL Upgrade from 5.5 to 5.7 in UBUNTU 14.04 LTS

wget http://dev.mysql.com/get/mysql-apt-config_0.7.2-1_all.deb
sudo dpkg -i mysql-apt-config_0.7.2-1_all.deb
sudo apt-get update
apt-key list
sudo apt-key adv --keyserver pgp.mit.edu --recv-keys A4A9406876FCBD3C456770C88C718D3B5072E1F5
sudo apt-get update
mysql -V
sudo apt-get install mysql-server
mysql --version