SSH2是一套安全通讯协议框架（早期的SSH1由于存在安全漏洞，现在已经不用了），基于SSH2协议的产品目前主要有openssh，putty，SSH Secure Shell Client等。安装了SSH2后，我们就可以通过Secure CRT连接服务器了。ubuntu10默认安装openssl.
检查和安装ssh
dpkg --list|grep ssh
//如果有openssh-client 和openssh-server,就不再需要再安装了
//如果openssh-server没有安装，可输入以下命令：
sudo apt-get install ssl
W: A error occurred during the signature verification. The repository is not updated and the previous index files will be used.GPG error: http://cn.archive.ubuntu.com lucid-updates Release: The following signatures were invalid: BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com>
W: Failed to fetch http://cn.archive.ubuntu.com/ubuntu/dists/lucid-updates/Release
W: Some index files failed to download, they have been ignored, or old ones used instead.
报错了，GPG和源的问题.
//网上的解决办法，但是我的无效。
sudo aptitude -o Acquire::http::No-Cache=True -o Acquire::BrokenProxy=true update
//多方查找，在国外的网站上找到方法。
guangbo@guangbo-laptop:~$ sudo apt-get clean
guangbo@guangbo-laptop:~$ cd /var/lib/apt
guangbo@guangbo-laptop:/var/lib/apt$ sudo mv lists lists.old
guangbo@guangbo-laptop:/var/lib/apt$ sudo mkdir -p lists/partial
guangbo@guangbo-laptop:/var/lib/apt$ sudo apt-get clean
guangbo@guangbo-laptop:/var/lib/apt$ sudo apt-get update
//重新安装
sudo apt-get install ssl
//查看是否安装成功
dpkg --list|grep ssh
ii openssh-client 1:5.3p1-3ubuntu6 secure shell (SSH) client, for secure access
ii openssh-server 1:5.3p1-3ubuntu6 secure shell (SSH) server, for secure access
ii ssh 1:5.3p1-3ubuntu6 secure shell client and server (metapackage)
ii ssh-askpass-gnome 1:5.3p1-3ubuntu4 interactive X program to prompt users for a
检测并启动ssh
ps -ef|grep openssl
//如果有openssl字眼，则表明已启动。
sudo /etc/init.d/ssh start
[sudo] password for guangbo:
* Starting OpenBSD Secure Shell server sshd
其它修改
至于更新源，我其实先更新下面的文件。但是未生效，于是有上面的方法。如果上面的方法生效，下面的请直接无视。
I'm also have the same problem... after googled for sometimes, I have finally found the solution here
just edit
Quote:
|
/etc/resolv.conf |
and put this at the top of it
Quote:
|
# google nameservers |
Quote:
|
sudo apt-get update |
and no more error
hope it will help
SecureCRT连接测试
//请确保ubunto10已启动ssh2协议，端口22.
sudo /etc/init.d/ssh start
SecureCRT配置
连接成功
