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GDebi is a tool that can install local deb packages (already downloaded manually) resolving and installing its dependencies.
Gdebi works in text mode and with a graphical interface.
Gdebi is preinstalled in all Sparky editions, if not install it via the command (all editions excluding KDE):
sudo apt-get install gdebi
Installation in Sparky KDE edition:
sudo apt-get install gdebi-core gdebi-kde
Right click on .deb file and choose to open it with gdebi and the installation will continue.