使用SecureCRTPortable连接不上虚拟机，使用Tcping小工具ping端口，发现22端口没有开启，
在虚拟机里开启22端口，发现需要安装openssh。
rick@ubuntu:~sudoapt−getinstallopenssh−server
报错:
rick@ubuntu: sudo apt-get install openssh-server
Reading package lists… Done
Building dependency tree
Reading state information… Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
openssh-server : Depends: openssh-client (= 1:5.8p1-1ubuntu3) but 1:6.2p2-6 is to be installed
Recommends: ssh-import-id but it is not going to be installed
E: Unable to correct problems, you have held broken packages.
使用如下命令:
rick@ubuntu:~sudoapt−getinstallopenssh−client=1:5.8p1−1ubuntu3
rick@ubuntu: sudo apt-get install openssh-server
rick@ubuntu:~$ netstat -tnl
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 ::1:631 :::* LISTEN
22端口已经开启, 现在可以用SecureCRTPortable连接。