It's important to understand that "eubacteria" is a broad term referring to a large and diverse group of bacteria. It's not accurate to say that eubacteria as a whole have a specific type of symbiotic relationship.

Instead, individual species of eubacteria can have different types of symbiotic relationships:

* Mutualism: Both the bacterium and the host benefit. For example, nitrogen-fixing bacteria in plant roots provide nitrogen for the plant, while the plant provides a habitat and nutrients for the bacteria.

* Commensalism: One organism benefits, while the other is neither harmed nor helped. For example, some bacteria live on our skin without causing harm or providing any particular benefit to us.

* Parasitism: One organism benefits at the expense of the other. For example, pathogenic bacteria cause disease in their hosts.

Therefore, to determine the type of symbiotic relationship a specific eubacterium has, we need to consider the particular species and its interaction with its host organism.