安装ubuntu 12.04 时选择了lamp server 的软件包（估计），记录一下，看看默认会安装那些包：
$ dpkg --get-selections |grep apache2
apache2 install
apache2-mpm-prefork install
apache2-utils install
apache2.2-bin install
apache2.2-common install
libapache2-mod-php5 install
$ dpkg --get-selections |grep php5
libapache2-mod-php5 install
php5-cli install
php5-common install
php5-gd install
php5-mcrypt install
php5-mysql install
$ dpkg --get-selections |grep mysql
libdbd-mysql-perl install
libmysqlclient18 install
libpam-mysql install
mysql-client-5.5 install
mysql-client-core-5.5 install
mysql-common install
mysql-server-5.5 install
mysql-server-core-5.5 install
php5-mysql install