在jetson nano上安装OpenCV4.1.1的完整流程（0）换源

本文环境Ubuntu18.04，本人在安装时走了很多弯路，特在此记录安装CV的血与泪 T_T，为后人铺路

（0）更新nano本身的镜像源

因为在更新包的时候不换国内源，慢到吐血

cd /etc/apt/
#备份source.list以备失误
sudo cp sources.list sources.list.bak
#用gedit打开sources.list
sudo gedit sources.list

复制以下源到文件内，自带源一个不留，记得改完点保存

#清华源
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main multiverse restricted universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main multiverse restricted universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main multiverse restricted universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main multiverse restricted universe
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main multiverse restricted universe
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main multiverse restricted universe
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main multiverse restricted universe
deb-src http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main multiverse restricted universe


#阿里云-ports
deb http://mirrors.aliyun.com/ubuntu-ports/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu-ports/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu-ports/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu-ports/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu-ports/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu-ports/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu-ports/ trusty-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu-ports/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu-ports/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu-ports/ trusty-backports main restricted universe multiverse

#网易163
# deb http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse
# deb http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ trusty main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ trusty-security main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ trusty-updates main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ trusty-proposed main restricted universe multiverse
# deb-src http://mirrors.163.com/ubuntu/ trusty-backports main restricted universe multiverse

#中科大
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates main restricted
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-updates multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security main restricted
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security universe
deb http://mirrors.ustc.edu.cn/ubuntu-ports/ bionic-security multiverse

这里注意，jetson源的口均为ubuntu-ports格式，这样才可以更新到jetson正确的库，而不是常规的Ubuntu的源。注意：代码中，我注释掉了网易163的源，因为在使用163源做更新时出现了‘忽略’报错，考虑可能163的源没有ubuntu-ports这个站，或者没有jetson特别的源，总之注释掉可以正确更新

换好更新源和软件哦

sudo apt-get update   
sudo apt-get upgrade