ASP.NET Core示例站点网址：http://about.cnblogs.com/
首先安装最新版的 .NET Core 运行环境，从 https://github.com/dotnet/cli 的 readme 中 "Ubuntu Installers" 部分获取 Shared Host、Shared Framework、Sdk 的下载地址，分别依次下载安装：
wget https://dotnetcli.blob.core.windows.net/dotnet/beta/Installers/Latest/dotnet-host-ubuntu-x64.latest.deb
dpkg -i dotnet-host-ubuntu-x64.latest.deb wget https://dotnetcli.blob.core.windows.net/dotnet/beta/Installers/Latest/dotnet-sharedframework-ubuntu-x64.latest.deb
dpkg -i dotnet-sharedframework-ubuntu-x64.latest.deb wget https://dotnetcli.blob.core.windows.net/dotnet/beta/Installers/Latest/dotnet-sdk-ubuntu-x64.latest.deb
dpkg -i dotnet-sdk-ubuntu-x64.latest.deb
安装后的 dotnet cli 版本是 1.0.0-rc2-002496 。
然后修改示例站点项目 AboutUs 的 project.json 文件：
1）frameworks 中的 "netstandardapp1.3" 改为 "netcoreapp1.0" ，imports 由 "portable-net45+win8" 改为 "portable-net45+wp80+win8+wpa81+dnxcore50"
2）dependecies 中添加：
"Microsoft.NETCore.App": {
"type": "platform",
"version": "1.0.0-rc2-23931"
},
接着将 NuGet.Config 中的 aspnetcidev 改为 aspnetcirelease：
<configuration>
<packageSources>
<clear />
<add key="AspNetCI" value="https://www.myget.org/F/aspnetcirelease/api/v3/index.json" />
<add key="NuGet.org" value="https://api.nuget.org/v3/index.json" />
</packageSources>
</configuration>
dotnet restore 之后，dotnet run 时出现错误：The dependency Ix-Async 1.2.5 does not support framework .NETCoreApp,Version=v1.0。在这个问题上困了很长时间，直到今天看到这篇博文 —— .NET Core 1.0 RC2 历险之旅，才发现了如下的解决方法：
在 "frameworks" -> "netcoreapp1.0" -> "imports" 中添加 "portable-net45+win8+wp8+wpa81" 与 "portable-net45+win8+wp8" 。
"frameworks": {
"netcoreapp1.0": {
"imports": [
"portable-net45+wp80+win8+wpa81+dnxcore50",
"portable-net45+win8+wp8+wpa81",
"portable-net45+win8+wp8"
]
}
}
解决这个问题之后，升级成功！