Nextcloud user:

 ncadmin

Nextcloud password

  nextcloud

Please note that both the user and password is changed during the first setup, as you will be asked to enter your own user and password..

How to become root in CLI:

Ubuntu has no root user, but you can become root by typing:

 :~$ sudo -i

If you forgot your password for the Nextcloud Web login, the this procedure will help you reset your password:

Log in to your terminal
$~: sudo -i
$~: nextcloud_occ user:resetpassword yourusername