jetson agx orin ubuntu20.04换源

因为jetson的主控板是arm架构，而在csdn上大部分的换源教程都是针对日常x86架构的主板，所以把他当作日常pc换源会出现错误，源内的软件也都是不适配的，这里给出博主换的源

1.备份原来的source文件

sudo mv /etc/apt/sources.list /etc/apt/sources.list.bak 
sudo gedit /etc/apt/sources.list  

2.将内容修改为

deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-updates main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-updates universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-updates multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-backports main restricted universe multiverse
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-security main restricted
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-security universe
deb http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ focal-security multiverse

# deb http://security.ubuntu.com/ubuntu xenial-security main
# deb-src http://security.ubuntu.com/ubuntu xenial-security main

3.重新sudo apt update，应该就成功了