Maria DB Unmet dependencies

Solved by manual installation of MariaDB as follows:

sudo apt-get install software-properties-common
sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8
sudo add-apt-repository 'deb [arch=amd64,i386] http://nyc2.mirrors.digitalocean.com/mariadb/repo/10.1/ubuntu xenial main'

sudo apt-get update
sudo apt-get install mysql-common mariadb-common libmysqlclient18 libmariadbclient18
mariadb-client-core-10.0 mariadb-client-10.0 mariadb-server-core-10.0
mariadb-server-10.0 libmariadbclient-dev mariadb-server

After that set the same root password you had before.