$ 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,arm64,ppc64el] http://mirror.nodesdirect.com/mariadb/repo/10.4/ubuntu bionic main' $ sudo apt update$ sudo apt install mariadb-server $ sudo vi /etc/apt/sources.list.d/MariaDB.list# MariaDB 10.4 repository list - c..