备份

http://www.manongjc.com/article/117062.html

修改bionic为xenial后直接update

ros的https://www.cnblogs.com/wjundong/p/10701160.html的密钥是对的,no,第一个是对的

init出错
https://www.cnblogs.com/xuhaoforwards/p/9399744.html

https://www.cnblogs.com/wjundong/p/10701160.html
rosinit

https://www.arduino.cn/thread-11266-1-1.html安装ros的

https://tieba.baidu.com/p/6498684990也是rosinit

https://blog.csdn.net/zhuodesheng/article/details/103994706

#####################
在小飞机情况下
https://www.itren.org/226.html
# GitHub Start
192.30.253.112      github.com
192.30.253.119      gist.github.com
151.101.184.133     assets-cdn.github.com
151.101.184.133     raw.githubusercontent.com
151.101.184.133     gist.githubusercontent.com
151.101.184.133     cloud.githubusercontent.com
151.101.184.133     camo.githubusercontent.com
151.101.184.133     avatars0.githubusercontent.com
151.101.184.133     avatars1.githubusercontent.com
151.101.184.133     avatars2.githubusercontent.com
151.101.184.133     avatars3.githubusercontent.com
151.101.184.133     avatars4.githubusercontent.com
151.101.184.133     avatars5.githubusercontent.com
151.101.184.133     avatars6.githubusercontent.com
151.101.184.133     avatars7.githubusercontent.com
151.101.184.133     avatars8.githubusercontent.com    
# GitHub End
add to /etc/hosts

https://www.cnblogs.com/knightningwing/p/11456463.html
then
wget https://raw.github.com/ros/rosdistro/master/rosdep/sources.list.d/20-default.list
#####################################


####################
https://developer.nvidia.com/cuda-80-ga2-download-archive
####################s




###########################
编译出错解决
https://blog.csdn.net/wangguchao/article/details/86561349
我的问题是缺少名字为编译的那个图里的东西
ros-melodic-image-transport
ros-melodic-pcl-ros
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