Install xdebug from sources php7.0

xdebug-install-php7

sudo apt-get install php7.0-dev
wget http://xdebug.org/files/xdebug-2.4.0rc2.tgz
tar -xzf xdebug-2.4.0rc2.tgz
cd xdebug-2.4.0RC2/
phpize
./configure --enable-xdebug
make
sudo cp modules/xdebug.so /usr/lib/.
#FOR FPM
sudo echo 'zend_extension="/usr/lib/xdebug.so"' > /etc/php/7.0/fpm/conf.d/20-xdebug.ini 
sudo echo 'xdebug.remote_enable=1' >> /etc/php/7.0/fpm/conf.d/20-xdebug.ini 
#FOR CLI
sudo echo 'zend_extension="/usr/lib/xdebug.so"' > /etc/php/7.0/cli/conf.d/20-xdebug.ini 
sudo echo 'xdebug.remote_enable=1' >> /etc/php/7.0/cli/conf.d/20-xdebug.ini
#RESTART 
sudo service php7.0-fpm restart

nice ty
clarification :
20-xdebug.ini is a file that should be created

instead of using sudo echo "something" > /some/file.txt, you should use echo "something" | sudo tee /some/file.txt

For example:

echo '
zend_extension="/usr/lib/xdebug.so"
xdebug.remote_enable=1
' | sudo tee /etc/php/7.0/cli/conf.d/20-xdebug.ini