[Maria-discuss] Ubuntu 16.04, Accidentally installed mariadb-server on top of mysql-server

Hello, Guys, I did a bad one. I only had one server remaining that still had mysql installed and thinking I was logged into my laptop's console, I executed apt-get install mariadb-server. I wasn't on my laptop. I was logged into a virtual hosting server and knocked eight sites offline including my wiki of all my HOWTO documents ironically, describing how to install mariadb-server on various platforms. I didn't notice anything was amiss until I saw a comment that it was uninstalling mysql (which I knew wasn't on my laptop) I was able to log in using my old root password, but all my databases were gone. Is there any hope for recovering the databases as they were earlier today? Rich