[Koha] Problems running koha-create on Ubuntu 16.04 with MariaDB

I am moving our library to a new server with Ubuntu 16.04. Following the instructions at https://wiki.koha-community.org/wiki/Koha_on_ubuntu_-_packages, I installed MariaDB instead of MySQL. When I run: sudo koha-create --create-db koha_library The result is: ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO) I'd been wrestling with this problem for awhile before I got to this point because I got similar messages when trying to configure phpmyadmin. I can run "mysql -u root -p". However, just "mysql -u root" fails with the above message as well. Is there a way to tell koha-create to run using a password? Or am I missing something? I am hoping someone has a quick solution. Daniel