sudo apt-get update

sudo apt-get install apache2-threaded-dev apache2-dev php5-dev php-pear make

sudo pecl install apc

sudo vi /etc/php5/apache2/php.ini //extension=apc.so  추가

sudo /etc/init.d/apache2 restart

//추후에 apc 업그레이드 하려면

//sudo pecl upgrade apc