PHP Warning: PHP Startup: Unable to load dynamic library ‘/usr/lib/php/20131226/curl.so’ – /usr/lib/php/20131226/curl.so: undefined symbol: zend_unset_property in Unknown on line 0 I am using Ubuntu 14.04 LTS and PHP v5.6 There are other versions in same machine php5 and php7 but php5.6 has been enabled. I tried to install cURL by Now I am getting Unable to load dynamic library curl.so