# sudo apt-key adv --recv-keys --keyserver hkp://keyserver.ubuntu.com:80 0xF1656F24C74CD1D8
# deb [arch=amd64,i386] http://ftp.hosteurope.de/mirror/mariadb.org/repo/10.3/ubuntu bionic main
# deb [arch=amd64,i386] http://mirror.netcologne.de/mariadb/repo/10.3/ubuntu bionic main
deb [arch=amd64] http://mirror2.hs-esslingen.de/mariadb/repo/10.3/ubuntu bionic main