Ubuntu install error " Your PHP has to have MySQL extension enabled "

Hi, I'm moving my FA db into a new computer which runs on Ubuntu 14.04. I'm getting following error while install FA
" Your PHP has to have MySQL extension enabled "

Here is my php.ini excert. Please guide how to fix it.

===== php.ini =======
; If you wish to have an extension loaded automatically, use the following
; syntax:
;
;   extension=modulename.extension
;
; For example, on Windows:
;
;   extension=msql.dll
;
; ... or under UNIX:
;
   extension=mysql.so

;
; ... or with a path:
;
;   extension=/path/to/extension/mysql.so
;
; If you only provide the name of the extension, PHP will look for it in its
; default extension directory.
;