Note:
- Jetpack4.2/4.3刷机过后的系统版本为ubuntu18.04
- TX2 本身 为ARM64架构的 CPU
0. 备份
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup
1. 查询发行版本号：lsb_release -c
Codename: bionic
2. 打开源文件：sudo nano /etc/apt/sources.list， 注释掉原有内容，复制以下内容
# 默认注释了源码镜像以提高 apt update 速度，如有需要可自行取消注释
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-backports main restricted universe multiverse
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-security main restricted universe multiverse
Ctrl+O保存，回车确定，Ctrl+x退出
3. 更新：sudo apt-get update
4. 可能出现的问题
宿主机的apt-get无法正确使用。原因是自带的刷机包（Jetpack/DriveInstall）给系统安装了arm64的软件包，报错如下：
Err:29 http://archive.ubuntu.com/ubuntu xenial/main arm64 Packages
404 Not Found [IP: 91.189.88.161 80]
Ign:37 http://archive.ubuntu.com/ubuntu xenial/universe arm64 Packages
Ign:40 http://archive.ubuntu.com/ubuntu xenial/multiverse arm64 Packages
Err:46 http://archive.ubuntu.com/ubuntu xenial-updates/main arm64 Packages
404 Not Found [IP: 91.189.88.161 80]
正确的解决方案为，修改/etc/apt/source.list在每一行的deb和http://×××中间加入[arch=amd64,i386]，修改后的source.list文件如下（仅供参考，请按需修改）：
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic main restricted
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates main restricted
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic universe
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates universe
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic multiverse
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-updates multiverse
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-backports main restricted universe multiverse
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security main restricted
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security universe
deb [arch=amd64,i386] http://mirrors.tuna.tsinghua.edu.cn/ubuntu/ bionic-security multiverse
deb [arch=amd64,i386] http://archive.ubuntu.com/ubuntu bionic universe
参考文献
https://blog.csdn.net/jiangchao3392/article/details/73251850
https://blog.csdn.net/QLULIBIN/article/details/80271096
http://s1nh.org/post/arm64-after-jetpack/
