ubuntu源码安装platon编译时不能访问golang.org导致失败，要如何解决？

[lovelessbiu]

Hi there,

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System information

PlatON version: platon version
OS & Version: Linux
Commit hash : (if develop)

Expected behaviour

编译完成之后在./build/bin目录下会生成platon, keytool等一系列可执行文件。

Actual behaviour

i/o timeout

Steps to reproduce the behaviour

Backtrace

[backtrace]