I just added the host to the debops_mariadb_server and ran debops.
I got the following error:
I tried adding mysql-client to the mariadb_server_packages variable, but it failed too.
Here's the log: https://gist.github.com/barraponto/d26d1fa3d8fec6bc6ff6
The automysqlbackup package for Ubuntu Trusty 14.04 can't be installed together with mariadb-client. It was fixed in Debian Jessie and newer versions of Ubuntu (14.10+).
Ubuntu Trusty package: http://packages.ubuntu.com/trusty/automysqlbackup
Debian Jessie package: https://packages.debian.org/jessie/automysqlbackup
Debian packaging thread: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=732878
This is being discussed upstream in Ubuntu:
So, it looks like Ubuntu team will try and backport the fix to Trusty. In the meantime, you could try switching the mariadb_server_flavor to mysql, it should work fine then. After you test it, it can be added to the flavor map to fix the issue on Trusty for the time being.