$ apt-cache search php|grep gd
php5-gd - GD module for php5
$ sudo apt-get install php5-gd

$ apt-cache search php|grep zip
libphp-pclzip - zip archive manager class for PHP
$ sudo apt-get install libphp-pclzip

$ sudo apt-get install libapache2-modxslt php-xml-htmlsax3 php-xml-parser php-xml-rss php-xml-serializer php-xml-util