thanks for you help i found out the json php was installed but not listed in etc/php/7.0/mods-available so i used sudo apt-get purge php-json then sudo apt-get install php-json is fixed my fault but now when i open up owncloud i get Internal Server Error my log looks like this
{“reqId”:“jGyAYvqFvO+jX+OoRcal”,“remoteAddr”:“192.168.1.3”,“app”:“index”,“message”:“Exception: {"Exception":"Error","Message":"Class ‘PDO’ not found","Code":0,"Trace":"#0 \/var\/www\/owncloud\/lib\/private\/Setup.php(170): OC\\Setup->getAvailableDbDriversForPdo()\n#1 \/var\/www\/owncloud\/lib\/private\/legacy\/util.php(642): OC\\Setup->getSupportedDatabases()\n#2 \/var\/www\/owncloud\/lib\/base.php(587): OC_Util::checkServer(Object(OC\\AllConfig))\n#3 \/var\/www\/owncloud\/lib\/base.php(973): OC::init()\n#4 \/var\/www\/owncloud\/index.php(37): require_once(‘\/var\/www\/ownclo…’)\n#5 {main}","File":"\/var\/www\/owncloud\/lib\/private\/Setup.php","Line":114}”,“level”:3,“time”:“2016-11-06T11:03:56+00:00”,“method”:“GET”,“url”:“/owncloud/”,“user”:“–”}
{“reqId”:“jGyAYvqFvO+jX+OoRcal”,“remoteAddr”:“192.168.1.3”,“app”:“PHP”,“message”:“PHP Startup: Unable to load dynamic library ‘/usr/lib/php/20151012/pdo_sqlite.so’ - /usr/lib/php/20151012/pdo_sqlite.so: undefined symbol: php_pdo_unregister_driver at Unknown#0”,“level”:3,“time”:“2016-11-06T11:03:56+00:00”,“method”:“GET”,“url”:“/owncloud/”,“user”:“–”}
i wouldn’t be surprised if its another php problem as tried installing and uninstalling a good few times now so might have broken other php files