Took me a while to understand what the issues was. Installed LAMP on Ubuntu 12.04 through sudo apt-get install lamp-server^ After all was done, I tried running an application which was making mysql connection. The following was reported PHP Fatal error: Call to undefined function mysql_connect() Checked phpinfo() output to find that mysql was not there. Checked /etc/php/apache2/php.ini Mysql extension was not being loaded. Added line, to no avail extension=php_mysql.so Finally, found that php5 itself was not installed. Went to Ubuntu software center. Installed php5, and Bingo!, mysql worked.