But the data folder is stored in somewhere else, so what can I do to reuse the original database and data folder?
I have installed a new owncloud folder in /var/www, when I type 127.0.0.1/index.php,
It ask me to create an admin account.
But if I type the original admin account, it complains: The username is already been used.
But I could not find a login option.
You will need Config/Config.php to recover properly