Upgrading to Mariadb10 seems to fail on my ubuntu 14 virtualbox.
What i did was restart the instance,
followed instruction from:
and prompt to replace my my.inf configuration with maintainer configuration.
but it still failed.
tail -n 200 /var/log/syslog turn out that it was unable to bind at 127.0.0.1.
so i vi /etc/mysql/my.inf
change the binding address to 0.0.0.0
and it works :)