Ubuntu 18.04 (i386, amd64, armhf, arm64, ppc64el)系统请运行如下命令:
sudo apt install gnupg ca-certificates
sudo apt-key...sources.list.d/mono-official-stable.list
Ubuntu 16.04 (i386, amd64, armhf, arm64, ppc64el)请运行如下命令:
sudo apt-key...apt/sources.list.d/mono-official-stable.list
Ubuntu 14.04 (i386, amd64, armhf, ppc64el)请运行如下命令:
sudo apt-key