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# To install .deb
sudo dpkg -i package_name.deb
# To uninstall .deb (dpkg installed) packages
# remove it using Adept, or type:
sudo apt-get remove package_name
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Install a downloaded program in Ubuntu - Linux
sudo dpkg -i package_file.deb
//or
sudo apt install path_to_deb_file
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#install downloaded .deb
sudo dpkg -i /path/name.deb
#install packages
sudo apt install package_name