回答:
libxml2ライブラリがありません。ターミナルからインストールします:
sudo apt-get install libxml2
You need to install the libs:32. Execute these commands:
sudo apt-get install libstdc++6:i386
sudo apt-get install libxml2:i386
In addition to making sure libxml2 is installed and depending on which version of Ubuntu you are running -- I upgraded from 10.04 to 12.04 -- you also might need to have ia32-libs installed as noted here.