Add repository
echo "deb http://packages.luisvmf.com/ stable main" | sudo tee /etc/apt/sources.list.d/luisvmf.com.list
curl -fsSL https://luisvmf.com/pgp-key.public | gpg --dearmor | sudo tee /etc/apt/trusted.gpg.d/luisvmfcom.gpg > /dev/null
sudo apt-get update

Install a package
apt-cache search luisvmf.com-qimon
sudo apt-get install luisvmf.com-qimon
sudo apt-get install luisvmf.com-imonkernelmodule
sudo apt-get install luisvmf.com-gaussfit
sudo apt-get install luisvmf.com-spectraread
sudo apt-get install luisvmf.com-spectraread-demoplugin
sudo apt-get install luisvmf.com-spectraread-imonv6plugin

Remove repository
sudo apt-get remove luisvmf.com-qimon
sudo apt-get remove luisvmf.com-imonkernelmodule
sudo rm /etc/apt/sources.list.d/luisvmf.com.list
sudo rm /etc/apt/trusted.gpg.d/luisvmfcom.gpg
...
sudo apt-get update