$ sudo apt-get update
$ sudo apt-get install libcppunit-subunit0 

libcppunit-subunit0 is installed in your system.

Make ensure the libcppunit-subunit0 package were installed using the commands given below,

$ sudo dpkg-query -l | grep libcppunit-subunit0 *

You will get with libcppunit-subunit0 package name, version, architecture and description in a table

libcppunit-subunit0 package basic information: