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instal .deb ubuntu

sudo dpkg -i package_file.deb

install/uninstall deb packages from linux/ubuntu

1. To install a .deb file, simply Right click on the .deb file, and choose Kubuntu Package Menu->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, remove it using Adept, or type:
sudo apt-get remove package_name

install deb file in ubuntu

sudo apt install path_to_deb_file

install ubuntu deb

#install downloaded .deb
sudo dpkg -i /path/name.deb

#install packages
sudo apt install package_name

install *.deb file in ubuntu

Install a downloaded program in Ubuntu - Linux
sudo dpkg -i package_file.deb
//or
sudo apt install path_to_deb_file