Ubuntu18.04: Git clone 时出现gnutls_handshake() failed: The TLS connection was non-properly terminated

Ubuntu 18.04 : Git clone 时出现gnutls_handshake() failed: The TLS connection was non-properly terminated

Git clone 过程出现如下报错：

gnutls_handshake() failed: The TLS connection was non-properly terminated.

解决方法1：

git config --global --unset http.proxy 
git config --global --unset https.proxy

解决方法2：

sudo git clone htts://github.com/.........