Jetson Nano 更換映象源

1、更換

NVIDIA官方提供的Linux映象版本為Ubuntu 18.04 LTS，映象預設的是Ubuntu官方源，在國內使用該源下載程式速度較慢，所以需要更換。

開啟/etc/apt/sources.list檔案，註釋原內容，在末尾新增下述內容（以清華大學映象源為例，注意映象源需要支援arm64架構）：

# 預設註釋了原始碼映象以提高 apt update 速度，如有需要可自行取消註釋
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

# 預釋出軟體源，不建議啟用
# 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

2、其他映象源

下面提供了國內幾個支援arm64架構的Ubuntu映象源：

清華大學映象源：

# 預設註釋了原始碼映象以提高 apt update 速度，如有需要可自行取消註釋
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

# 預釋出軟體源，不建議啟用
# 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

中國科學技術大學映象源：

# 預設註釋了原始碼映象以提高 apt update 速度，如有需要可自行取消註釋
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

# 預釋出軟體源，不建議啟用
# 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

阿里巴巴映象站：

# 預設註釋了原始碼映象以提高 apt update 速度，如有需要可自行取消註釋
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

# 預釋出軟體源，不建議啟用
# 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

3、系統更新

系統源和軟體源配置完成以後，使用下述兩條命令更新：

sudo apt update
sudo apt upgrade -y