推荐VPN：

https://vpnso.com/

如果还是有问题，比如：

重新编译Git，使用openssl替换gnutls，方法如下：

http://askubuntu.com/questions/186847/error-gnutls-handshake-failed-when-connecting-to-https-servers

http://blog.csdn.net/chunyang_guo/article/details/12849947

参考资料：

http://www.cnblogs.com/ghj1976/p/5087049.html

http://golangtc.com/t/550649d5421aa911ea000016

http://www.jianshu.com/p/e680615e9574

https://ywwd.net/read-1130

https://ywwd.net/read-1115

http://stackoverflow.com/questions/31867347/i-am-having-trouble-getting-golang-org-x-tools-cmd-goimports

http://studygolang.com/articles/2068

http://studygolang.com/articles/5690

http://www.golangtc.com/t/550649d5421aa911ea000016

http://www.cnblogs.com/ghj1976/p/5087049.html