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Install/uninstall .deb files

These files are Debian packages. The package files associated with Ubuntu have the .deb suffix because of Ubuntu's close relations with the Debian GNU/Linux distribution. You will need administrative privileges to install a .deb file (see the section called “Root And Sudo”).

  1. To install a .deb file, simply double click on it, 

and then select Install Package

  2. Alternatively, you can also install a .deb file by opening a terminal
and typing:
     sudo dpkg -i package_file.deb
  3. To uninstall a .deb file, deselect it in your package manager, or type:
     sudo dpkg -r package_name

source: verbatim from https://help.ubuntu.com/ubuntu/desktopguide/C/install-file.html