It is nothing but, just check if PHP module mysqli is compiled and enabled in the server.
Search the list “php -m” for mysqli. If present make sure the correct extension_directory is set in the php.ini and enabled extension=mysqli.so as well.
If not present, recompile php(include current modules present and in addition add mysqli too). After that check the module comes in the list “php -m” and enable extension=mysqli.so in the php.ini file. Then try loading the drupal page or remove it and reinstall using softaculous again.
It will load fine then 🙂