Ubuntu Linux – How Do I install .deb Packages?

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I am a new Ubuntu Linux user. How can I install a package called package.deb? Can I use Synaptic front-end package management tool to install packages from the CD or Internet such as apt command or apt-get command. However, I would like to install a special .deb file. How do I install .deb package from the terminal using command line option in Ubuntu Linux or Debian Linux?