.Net Core的安装包的分发地址如下：
https://apt-mo.trafficmanager.net/repos/dotnet-release/pool/main/d/
方法一：
可以分别手动下载和安装sharedframework 和 SDK.
dotnet-dev-1.0.0-preview2-003131/
dotnet-sharedframework-microsoft.netcore.app-1.0.1/
方法二：通过命令行安装
sudo sh -c 'echo "deb [arch=amd64] https://apt-mo.trafficmanager.net/repos/dotnet-release/ trusty main" > /etc/apt/sources.list.d/dotnetdev.list'
sudo apt-key adv --keyserver apt-mo.trafficmanager.net --recv-keys 417A0893
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv-keys 417A0893
sudo apt-get update
sudo apt-get install dotnet-dev-1.0.0-preview2-003131