To install Ioncube loader into Ubuntu 10.10, we need match the kernel bit ioncubeloader with server. In this example, i will use 64 bit because i'm using Ubuntu 64 bit. So, first we need to download and install into our server :

1. Download and extract
wget -c http://downloads2.ioncube.com/loader_downloads/ioncube_loaders_lin_x86-64.zip
unzip ioncube_loaders_lin_x86-64.zip

2. Move ioncube into /usr/local/lib
sudo mv ioncube /usr/local/lib/

3. Adding zend_extension = "/usr/local/lib/ioncube/ioncube_loader_lin_5.3.so" into php.ini
sudo vim /etc/php5/apache2/php.ini

Now, Ioncube loader 64 bit already installed in your server. Check by phpinfo();