我试图在我的Ubuntu 16.10上为GitHub生成新的GPG密钥。但是，它以错误消息gpg: Sorry, no terminal at all requested - can't get input结束。我也试过了gpg2，没有区别。
包括终端输出：
greeny@greenyNB:~$ gpg2 --gen-key
gpg (GnuPG) 2.1.11; Copyright (C) 2016 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
gpg: Sorry, no terminal at all requested - can't get input
greeny@greenyNB:~$ gpg --gen-key
gpg (GnuPG) 1.4.20; Copyright (C) 2015 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
gpg: Sorry, no terminal at all requested - can't get input
如何修复此问题以便能够生成GPG密钥？