Ubuntu10 下 SSH2 协议安装 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下SSH2协议安装

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

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
nameserver 8.8.8.8
nameserver 8.8.4.4

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