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1.尝试安装screen,输入命令:apt install screen
输出:Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Unable to locate package screen
解决办法:问题出在在执行sudo apt-get install之前更换了软件源,但是却忘了update下
sudo apt-get update 命令执行完毕,再重新安装即可