Debian source settings are installed with debian 6, which can be connected via SSH on the GUI, but not in the black window. The reason is that the sshd service (ps-ef | grep ssh) is not started in the black window, and the check result is as follows, it turns out that the sshd service is not installed in the black window (I don't know how it works under the graphic interface = ). Baidu Knows That sshd requires openssh-server to be installed. If apt-cache search openssh-server is not found, you have to configure the source, I have never succeeded in Sohu 163 on the Internet. 1. comment out/etc/apt/sources. list of cdrom, or you will need to insert the Disk 2. add the http://http.us.debian.org/debian/ stable main 3. apt-get update: openssh-server is found in the search. you can install apt-apy on the "OK" Page. Then you can run the apt-spy command to update apt-spy update, find the fastest source in Asia and write it to sources. in list, apy-spy-d unstable-a asia-t 5