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睿洛医疗
0，准备
轻易不要搞，弄不好就成砖头了。
多开几个远程连接，避免安装过程中断掉。
1，完全卸载
sudo apt-get remove openssh-server openssh-client --purge -y2，openssh安装
apt-get install openssh-server openssh-client3，openssh重启
systemctl restart ssh4，可能的问题1：
apt源不可用，无法安装
解决办法：
查看系统版本
cat /etc/issue更新安装源，按自己系统版本替换内容
vim /etc/apt/sources.listUbuntu 14.04
deb https://mirrors.aliyun/ubuntu/ trusty main restricted universe multiverse
deb-src https://mirrors.aliyun/ubuntu/ trusty main restricted universe multiverse
deb https://mirrors.aliyun/ubuntu/ trusty-security main restricted universe multiverse
deb-src https://mirrors.aliyun/ubuntu/ trusty-security main restricted universe multiverse
deb https://mirrors.aliyun/ubuntu/ trusty-updates main restricted universe multiverse
deb-src https://mirrors.aliyun/ubuntu/ trusty-updates main restricted universe multiverse
deb https://mirrors.aliyun/ubuntu/ trusty-backports main restricted universe multiverse
deb-src https://mirrors.aliyun/ubuntu/ trusty-backports main restricted universe multiverse
## Not recommended
# deb https://mirrors.aliyun/ubuntu/ trusty-proposed main restricted universe multiverse
# deb-src https://mirrors.aliyun/ubuntu/ trusty-proposed main restricted universe multiverse
ubuntu 16.04
deb http://mirrors.aliyun/ubuntu/ xenial main
deb-src http://mirrors.aliyun/ubuntu/ xenial main
deb http://mirrors.aliyun/ubuntu/ xenial-updates main
deb-src http://mirrors.aliyun/ubuntu/ xenial-updates main
deb http://mirrors.aliyun/ubuntu/ xenial universe
deb-src http://mirrors.aliyun/ubuntu/ xenial universe
deb http://mirrors.aliyun/ubuntu/ xenial-updates universe
deb-src http://mirrors.aliyun/ubuntu/ xenial-updates universe
deb http://mirrors.aliyun/ubuntu/ xenial-security main
deb-src http://mirrors.aliyun/ubuntu/ xenial-security main
deb http://mirrors.aliyun/ubuntu/ xenial-security universe
deb-src http://mirrors.aliyun/ubuntu/ xenial-security universe
ubuntu 18.04
deb http://mirrors.aliyun/ubuntu/ bionic main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-security main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-security main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-updates main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-updates main restricted universe multiverse
# deb http://mirrors.aliyun/ubuntu/ bionic-proposed main restricted universe multiverse
# deb-src http://mirrors.aliyun/ubuntu/ bionic-proposed main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ bionic-backports main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ bionic-backports main restricted universe multiverse
ubuntu 20.04
deb http://mirrors.aliyun/ubuntu/ focal main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ focal main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ focal-security main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ focal-security main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ focal-updates main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ focal-updates main restricted universe multiverse
# deb http://mirrors.aliyun/ubuntu/ focal-proposed main restricted universe multiverse
# deb-src http://mirrors.aliyun/ubuntu/ focal-proposed main restricted universe multiverse
deb http://mirrors.aliyun/ubuntu/ focal-backports main restricted universe multiverse
deb-src http://mirrors.aliyun/ubuntu/ focal-backports main restricted universe multiverse
替换后更新
apt update再装，成功
apt-get install openssh-server openssh-client5，可能的问题2：
无法启动openBSD
解决办法：
因为没卸载干净或者还原了旧的配置文件。卸载干净再装就好了。（openssh的配置文件很简单，就几个开关不用备份）
sudo apt-get remove openssh-server openssh-client --purge -y6，可能的问题3：
openssh安装且重启成功后，测试远程链接。
解决办法：
ssh-keygen -R 8.14.XX.XX参考：阿里云开发者社区https://developer.aliyun/mirror/ubuntu?spm=a2c6h.13651102.0.0.3e221b11IOP122
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