Warnings and errors after installing...

[jmituzas]

• I am running this on Ubuntu 12.04 server
  
• and when I go to Advanced Parameters/Performance I get these Warnings
  

• To use Memcached, you must install the Memcache PECL extension on your server. http://www.php.net/manual/en/memcache.installation.php
  

 

Have followed this guide for ubuntu and test reports internal error 500 with no troubleshooting instructions.

 

• To use Xcache, you must install the Xcache extension on your server. http://xcache.lighttpd.net
  

 

I tried installing Xcache and it removed php-apc in order to install it and still

didn't fix the error.Where do I find information on fixing these issues and the one below:

• Smarty optimization
  

Everything else I have done just some problems with these.