Instal file Deb
sudo dpkg -i /path/to/deb/file
sudo apt-get install -f
Cybernated Dev
sudo dpkg -i /path/to/deb/file
sudo apt-get install -f
sudo dpkg -i package_file.deb
sudo apt install path_to_deb_file
#install downloaded .deb
sudo dpkg -i /path/name.deb
#install packages
sudo apt install package_name
sudo apt install ./file_name.deb
Ubuntu is BASED on debian
Therefore ubuntu users should use .deb files, not .rpm