使用jetson玩具的玩家刚开始可能会遇到如下问题，简单记录一下分享

解决安装jetpack时ssh连接不上的问题：
sudo rm /etc/ssh/ssh*key
sudo dpkg-reconfigure openssh-server
sudo service sshd restart

ping 设备ip和pc端ip
ssh 设备登录是否正常
ps -e | grep ssh//查看ssh是否开启
apt-get install openssh-client//安装ssh客户端程序
apt-get install openssh-server//安装ssh服务端程序
service ssh start//开启ssh服务

 Access to APT repository and ability to install Debian packages with it.
Your system is not ready for install, see specific errors below. Once fixed, click 'Retry' to verify system readiness again.

W: GPG error: file:/var/cuda-repo-l4t-10-2-local  Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F60F4B3D7FA2AF80
E: The repository 'file:/var/cuda-repo-l4t-10-2-local  Release' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details

解决方法如下 

udo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys F60F4B3D7FA2AF80
Executing: /tmp/apt-key-gpghome.mjSGXKKf3N/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys F60F4B3D7FA2AF80
gpg: key F60F4B3D7FA2AF80: public key "cudatools <cudatools@nvidia.com>" imported
gpg: Total number processed: 1
gpg:               imported: 1

sudo apt-get update && sudo apt-get check
Get:1 file:/var/cuda-repo-l4t-10-2-local  InRelease
Ign:1 file:/var/cuda-repo-l4t-10-2-local  InRelease
Get:2 file:/var/cuda-repo-l4t-10-2-local  Release [564 B]
Get:2 file:/var/cuda-repo-l4t-10-2-local  Release [564 B]                                            
Get:3 file:/var/cuda-repo-l4t-10-2-local  Release.gpg [836 B]                                                                         
Get:3 file:/var/cuda-repo-l4t-10-2-local  Release.gpg [836 B]                                                
Get:4 file:/var/cuda-repo-l4t-10-2-local  Packages [10.5 kB]                                                                              
Hit:5 http://ports.ubuntu.com/ubuntu-ports bionic InRelease                                                 
Hit:6 http://ports.ubuntu.com/ubuntu-ports bionic-updates InRelease                                       
Hit:7 http://ports.ubuntu.com/ubuntu-ports bionic-backports InRelease                                      
Hit:8 http://ports.ubuntu.com/ubuntu-ports bionic-security InRelease                                       
Hit:9 https://repo.download.nvidia.cn/jetson/common r32.6 InRelease                  
Hit:10 https://repo.download.nvidia.cn/jetson/t194 r32.6 InRelease
Reading package lists... Done                     
Reading package lists... Done
Building dependency tree       
Reading state information... Done

根据报错提示内容解决

除了开发套件以外的设备硬件供应商的设备都不能使用SDKmanger安装OS镜像，这个工具只是用来安装软件工具的，甚至你可以不使用Sdkmanger单独下载其中的独立工具包使用