报错信息如下：

Cloning into 'gramine'...

fatal: unable to access 'https://github.com/gramineproject/gramine.git/': GnuTLS recv error (-110): The TLS connection was non-properly terminated.

一，临时解决办法

git clone --recursive 'https://github.com/valloric/youcompleteme.git

二，永久解决办法

解决方法（顺序执行以下代码）：

apt-get install gnutls-bin

git config --global http.sslVerify false

git config --global http.postBuffer 1048576000