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Install wordpress
Apache
Install Apache, PHP & MySQL
sudo apt-get install apache2
sudo apt-get install php5
sudo apt-get install libapache2-mod-php5
sudo apt-get install mysql-server php5-mysql
sudo /etc/init.d/apache2 restart
Allow permalinks
Backup and restore
Before of this install the plugin (you can do it on the admin panel) backupwordpress.
Make and download a backup file. This file must contain files and database.
Format server
Install apache, php and Mysql
Go to /var/www/html
Download with wget the last Wordpress.
Unzip the wordpress file.
Upload the previous backup file.