1、首先把sources.list更换成如下源
deb http://mirror.lzu.edu.cn/openkylin/ yangtze main cross pty
deb http://mirror.lzu.edu.cn/openkylin/ yangtze-security main cross pty
deb http://mirror.lzu.edu.cn/openkylin/ yangtze-updates main cross pty
deb http://mirror.lzu.edu.cn/openkylin/ yangtze-proposed main cross pty
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-updates main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ focal-security main restricted universe multiverse
2、使用sudo apt-get update时会报错，报错内容是缺少什么公钥
3、输入如下命令解决步骤2的问题
sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 3B4FE6ACC0B21F32
4、再次输入
sudo apt-get update 更新完之后安装telnet
- sudo apt-get install telnet
- sudo apt-get install telnetd
- sudo apt-get install openbsd-inetd
- sudo apt-get install xinetd
- sudo /etc/init.d/xinetd restart 或 sudo systemctl restart xinetd
- netstat -a | grep telnet
- telnet localhost(IP地址)
5、最后是bug----windows系统telnet之后输入用户名与密码会出现如下乱码
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