vim /etc/apt/sources.list
deb http://mirrors.aliyun.com/ubuntu/ jammy main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-backports main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ jammy-security main restricted universe multiverse
apt --download-only install telnetd
文件保存位置：/var/cache/apt/archives
dpkg -i *.deb
systemctl enable inetd
systemctl start inetd
systemctl status inetd