Magento 2 Required many extension to run, but if the extension not found then it’s show error. To fix that you need to install the extension.
Here is the sampling process.
On the image: to install the missing extension type
apt-get install php-extension_name
i.e : for curl extension install type : apt-get install php-curl
By automatically the extension cannot be enabled. So to enabled reload apache: systemctl reload apache2
After successfully install all extension you will find this screen.