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

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

我遇到了这个问题，感觉关了ssl验证不太好

用sudo apt install apt-transport-https 之后解决了