ubuntu的arm源

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源主页：

清华：https://mirrors.tuna.tsinghua.edu.cn/

科大：http://mirrors.ustc.edu.cn/

ubuntu：http://ports.ubuntu.com/

1.地址不要使用https的（尽管https也可以用浏览器打开，但apt-get时会失败）

2.ubuntu-ports里面有arm64的源，如果是PC机X86、X64使用ubuntu

3.xenial是ubuntu16.04（即发行版本)

security：仅修复漏洞，并且尽可能少的改变软件包的行为。低风险。

backports：backports的团队则认为最好的更新策略是security 策略加上新版本的软件（包括候选版本的）。但不会由Ubuntu security team审查和更新。

updates：修复严重但不影响系统安全运行的漏洞，这类补丁在经过QA人员记录和验证后才提供，和security那类一样低风险。

proposed：update类的测试部分，仅建议提供测试和反馈的人进行安装。

4.软件自由度

The four main repositories are:
Main - Canonical-supported free and open-source software.
Universe - Community-maintained free and open-source software.
Restricted - Proprietary drivers for devices.
Multiverse - Software restricted by copyright or legal issues.

main:完全的自由软件。

universe:ubuntu官方不提供支持与补丁，全靠社区支持。

restricted:不完全的自由软件。

muitiverse：非自由软件，完全不提供支持和补丁。

清华源：

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

科大源：

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial main multiverse restricted universedeb http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial-security main multiverse restricted universedeb http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial-updates main multiverse restricted universedeb http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial-backports main multiverse restricted universedeb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial main multiverse restricted universedeb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial-security main multiverse restricted universedeb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial-updates main multiverse restricted universedeb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial-backports main multiverse restricted universe

ubuntu：

deb http://ports.ubuntu.com/ubuntu-ports/ xenial main multiverse restricted universedeb http://ports.ubuntu.com/ubuntu-ports/ xenial-security main multiverse restricted universedeb http://ports.ubuntu.com/ubuntu-ports/ xenial-updates main multiverse restricted universedeb http://ports.ubuntu.com/ubuntu-ports/ xenial-backports main multiverse restricted universedeb-src http://ports.ubuntu.com/ubuntu-ports/ xenial main multiverse restricted universedeb-src http://ports.ubuntu.com/ubuntu-ports/ xenial-security main multiverse restricted universedeb-src http://ports.ubuntu.com/ubuntu-ports/ xenial-updates main multiverse restricted universedeb-src http://ports.ubuntu.com/ubuntu-ports/ xenial-backports main multiverse restricted universe

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