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使用 sudo apt-get install openssh-server  命令后
提示:
Package openssh-server is not available, but is referred to by another
package. This may mean that the package is missing, has been obsoleted,
or is only available from another source.
E: Package openssh-server has no installation candidate.

使用 sudo /etc/init.d/ssh start 或者restart  提示:
/ect/init.d/ssh:command not found
表示不存在,,那为什么还装不了!

先用apt-get install -f 清理一下软件包，再试试

apt-get install -f   后
提示: 0 upgraded,0 newly installed,0 to remove and 0 not upgraded

再去安装,还是那个错误

最后在一个老外的网站上看到如下解决方案：
Thank you everyone. I did the "sudo apt-get update" (took a while), and then the "sudo apt-get install openssh-server" worked!





Basic apt tutorial.

Apt looks at your sources.list file to find the download servers for all software to install. Package managers such as synaptic also look at your sources.list file. This file is located at /etc/apt/sources.list. Apt is a very useful and powerful tool that is very easy to use. Synaptic is a GUI interface available in the gnome desktop environment to control apt. Adversely Kpackage does the same thing in the KDE desktop environment.

If you want to search for a package you can use apt-cache

Code:
apt-cache search To install a package use apt-get install

Code:
apt-get install To Remove a package use apt-get remove

Code:
apt-get remove When removing software in some files such as configurations are not always removed. To completely remove a package use the purge switch

Code:
apt-get remove --purge To fix broken packages use the force option with install

Code:
apt-get -f install*** Note there was not a package name specified here. This is intentional.

To perform a system update use apt-get upgrade

Code:
apt-get upgradeTo perform a distribution upgrade use apt-get dist-upgrade

Code:
apt-get dist-upgradeTo re-load your sources.list file use apt-get update

Code:
apt-get update
using the above information you should be able to do almost anything related to package management on your system.

作者：jackxiang@向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
地址：http://jackxiang.com/post/3256/
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