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#install pre-reqs
sudo apt install gnupg ca-certificates

#add key
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 3FA7E0328081BFF6A14DA29AA6A19B38D3D831EF

#add repo
echo "deb [arch=amd64] https://download.mono-project.com/repo/ubuntu stable-focal main" | sudo tee /etc/apt/sources.list.d/mono-official-stable.list

#update package list
sudo apt-get update

#install mono
sudo apt update -y

#optional - show package
sudo apt list --installed | grep mono