Something:
cd /tmp curl https://packages.microsoft.com/keys/microsoft.asc | gpg --dearmor > microsoft.gpg sudo mv microsoft.gpg /etc/apt/trusted.gpg.d/microsoft.gpg sudo sh -c 'echo "deb [arch=amd64] https://packages.microsoft.com/repos/microsoft-ubuntu-$(lsb_release -cs)-prod $(lsb_release -cs) main" > /etc/apt/sources.list.d/dotnetdev.list'
Now Update, and install .NET SDK…
sudo apt update PKG=$(sudo apt search dotnet-sdk | grep $(lsb_release -cs) | sed '$s/\//\n/g' | grep -v $(lsb_release -cs)) sudo apt install $PKG -y
If you want to serve web applications, see netcore