sudo apt-get install mariadb-galera-server mariadb-test 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 mariadb-test : Depends: mariadb-test-5.5 but it is not going to be installed
E: Broken packages

$ sudo apt-get install mariadb-test 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  libdbd-mysql-perl libdbi-perl libhtml-template-perl libmariadbclient18 libmysqlclient16 libmysqlclient18
  libnet-daemon-perl libplrpc-perl mariadb-client-5.5 mariadb-client-core-5.5 mariadb-common mariadb-server-5.5
  mariadb-server-core-5.5 mariadb-test-5.5 mysql-common

...

$ sudo apt-get install mariadb-galera-server
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following extra packages will be installed:
  galera mariadb-galera-server-5.5
Suggested packages:
  tinyca
The following packages will be REMOVED:
  mariadb-server-5.5 mariadb-server-core-5.5 mariadb-test mariadb-test-5.5
...

$ sudo apt-get install mariadb-test
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following package was automatically installed and is no longer required:
  galera
Use 'apt-get autoremove' to remove them.
The following extra packages will be installed:
  mariadb-server-5.5 mariadb-server-core-5.5 mariadb-test-5.5
Suggested packages:
  tinyca
The following packages will be REMOVED:
  mariadb-galera-server mariadb-galera-server-5.5
The following NEW packages will be installed:
  mariadb-server-5.5 mariadb-server-core-5.5 mariadb-test mariadb-test-5.5
...