当我尝试安装 snap 应用程序时出现此错误：
$ sudo snap install notes
error: cannot perform the following tasks:
- Download snap "core" (1689) from channel "stable"
(Get https://068ed04f23.site.internapcdn.net/download-snap/99T7MUlRhtI3U0QFgl5mXXESAiSwt776_1689.snap?t=2017-05-18T16:17:18Z&h=6a735f4388adcdba94c2d95a93fa5f36cde25a87: net/http: TLS handshake timeout)