Today i have installed the xdebug packets. After installing them my phpmyadmin and different other softwares aren't working anymore. PhpMyAdmin gives this output: json extension is missing. First there was an other error displayed: mbstring extension is missing. I could fix this error by installing the zend-php-extensions. Im using Ubuntu 12.04 and the zend server for php5.2.
How can i install this extension?