NVIDIA官方提供的Linux镜像版本为Ubuntu 18.04 LTS，镜像默认的是Ubuntu官方源，在国内使用该源下载程序速度较慢，所以需要更换。
为防止误操作后无法恢复，先备份原文件
代码语言：javascript复制sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak终端输入命令打开源配置文件：
代码语言：javascript复制sudo gedit /etc/apt/sources.list注意：此条命令必须在jetson nano系统桌面输入，不能使用ssh，否则将会报错！
如果熟悉vim，可以使用vim命令替代，此命令可在ssh中输入
代码语言：javascript复制sudo vim /etc/apt/sources.list接着，删除掉文件内全部内容并输入一下内容（三选一）
一、清华大学镜像源（推荐）
代码语言：javascript复制# 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
deb https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports/ bionic-proposed main restricted universe multiverse二、中国科学技术大学镜像源：
代码语言：javascript复制# 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 http://mirrors.ustc.edu.cn/ubuntu-ports bionic main restricted universe multiverse
# deb-src http://mirrors.ustc.edu.cn/ubuntu-ports bionic main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports bionic-updates main restricted universe multiverse
# deb-src http://mirrors.ustc.edu.cn/ubuntu-ports bionic-updates main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports bionic-backports main restricted universe multiverse
# deb-src 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 universe multiverse
# deb-src http://mirrors.ustc.edu.cn/ubuntu-ports bionic-security main restricted universe multiverse
deb http://mirrors.ustc.edu.cn/ubuntu-ports bionic-proposed main restricted universe multiverse
deb-src http://mirrors.ustc.edu.cn/ubuntu-ports bionic-proposed main restricted universe multiverse三镜像源：
代码语言：javascript复制# 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.aliyun.com/ubuntu-ports/ bionic main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu-ports/ bionic main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu-ports/ bionic-updates main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu-ports/ bionic-backports main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu-ports/s bionic-backports main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu-ports/ bionic-security main restricted universe multiverse
# deb-src https://mirrors.aliyun.com/ubuntu-ports/ bionic-security main restricted universe multiverse
deb https://mirrors.aliyun.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse
deb-src https://mirrors.aliyun.com/ubuntu-ports/ bionic-proposed main restricted universe multiverse接着，保存并退出，输入以下命令更新系统和软件源：
代码语言：javascript复制sudo apt update
sudo apt upgrade -y
