The following packages have unmet dependencies:
mariadb-server : Depends: mariadb-server-10.1 (= 10.1.6+maria-1~vivid) but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
Fix buildbot failures in main server trees
Merge downstream Debian/Ubuntu packaging into upstream MariaDB
MariaDB 10.0 is not installable on Trusty when "trusty-updates universe" is in sources.list
[PATCH] Systemd start after upgrade from MySQL 5.6 to MariaDB 10.0 does not work on Sid, Vivid, Wily
10.0 backport pull request