how to install .devb code example
Example 1: install deb file in ubuntu
sudo apt install path_to_deb_file
Example 2: install ubuntu deb
#install downloaded .deb
sudo dpkg -i /path/name.deb
#install packages
sudo apt install package_name
sudo apt install path_to_deb_file
#install downloaded .deb
sudo dpkg -i /path/name.deb
#install packages
sudo apt install package_name