How to install lxml on Ubuntu

I'm having difficulty installing lxml with easy_install on Ubuntu 11. When I type `$ easy_install lxml` I get: Searching for lxml Reading http://pypi.python.org/simple/lxml/ Reading http://codespeak.net/lxml Best match: lxml 2.3 Downloading http://lxml.de/files/lxml-2.3.tgz Processing lxml-2.3.tgz Running lxml-2.3/setup.py -q bdist_egg --dist-dir /tmp/easy_install-7UdQOZ/lxml-2.3/egg-dist-tmp-GacQGy Building lxml version 2.3. Building without Cython. ERROR: /bin/sh: xslt-config: not found ** make sure the development packages of libxml2 and libxslt are installed ** Using build configuration of libxslt In file included from src/lxml/lxml.etree.c:227:0: src/lxml/etree_defs.h:9:31: fatal error: libxml/xmlversion.h: No such file or directory compilation terminated. It seems that `libxslt` or `libxml2` is not installed. I've tried following the instructions at http://www.techsww.com/tutorials/libraries/libxslt/installation/installing_libxslt_on_ubuntu_linux.php and http://www.techsww.com/tutorials/libraries/libxml/installation/installing_libxml_on_ubuntu_linux.php with no success. If I try `wget ftp://xmlsoft.org/libxml2/libxml2-sources-2.6.27.tar.gz` I get <successful connection info> ==> SYST ... done. ==> PWD ... done. ==> TYPE I ... done. ==> CWD (1) /libxml2 ... done. ==> SIZE libxml2-sources-2.6.27.tar.gz ... done. ==> PASV ... done. ==> RETR libxml2-sources-2.6.27.tar.gz ... No such file `libxml2-sources-2.6.27.tar.gz'. If I try the other first, I'll get to `./configure --prefix=/usr/local/libxslt --with-libxml-prefix=/usr/local/libxml2` and that will fail eventually with: checking for libxml libraries >= 2.6.27... configure: error: Could not find libxml2 anywhere, check ftp://xmlsoft.org/. I've tried both versions `2.6.27` and `2.6.29` of `libxml2` with no difference. Leaving no stone unturned, I have successfully done `sudo apt-get install libxml2-dev`, but this changes nothing.