问题：
GNU Screen seems to freeze. GNU Screen 似乎冻结了。 Unable to enter user input.无法输入用户输入。
I was using GNU screen and when I pressed the screen it became unresponsive.我正在使用 GNU 屏幕，当我按下屏幕时，它变得没有响应。 I can execute all the GNU screen commands, but can't enter user input.我可以执行所有 GNU 屏幕命令，但无法输入用户输入。 I don't want to kill this screen as I have important work and I don't want to lose it.我不想杀死这个屏幕，因为我有重要的工作，我不想失去它。