无法在Ubuntu 14.04的终端中退出emacs

我正在ubuntu 14.04上的终端中运行emacs：

I'm running emacs in my terminal on ubuntu 14.04:

$ emacs -nw

如果我尝试退出 Cx Cc ，我会在和弦中看到这一点底部的空间：

If I try to exit with C-x C-c, I see this in the chord space at the bottom:

C-x-

我是Emacs的新手，但是即使我抬起手指，这似乎也试图用 c 键制作和弦按 Ctrl 键。如果我只是按下 c 我会得到

I'm an Emacs newb but this looks like its trying to make a joined chord with the c key even though I lift my finger way up over the Ctrl key. If I just hit c I get

C-x c is undefined

现在，如果我在弹出式编辑器中正常运行emacs，我可以退出。我在做什么错？

Now if I run emacs normally in the pop up editor, I'm able to exit just fine. What am I doing wrong?