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Conflicts: the Conflicts Field
The Conflicts field indicates when a package cannot be installed simultaneously with another. The most common reasons for this are that both packages include a file of the same name, provide the same service on the same transmission control protocol (TCP) port, or would hinder each other’s operation.
If it triggers a conflict with an already installed package, dpkg will refuse to install a package, except if the new package specifies that it will replace the installed package, in which case dpkg will choose to replace the old package with the new one. APT always follows your instructions: if you choose to install a new package, it will automatically offer to uninstall the package that poses a problem.