更換步驟
以root身份打開 /etc/apt/sources.list ，至于用什么打開隨意
將 http://ports.ubuntu.com/ 全部替換為 http://mirrors.ustc.edu.cn/ubuntu-ports/ ，這是中科大的
執行 sudo apt-get update 和 sudo apt-get upgrade 測試

查看是否提供arm支持的方法

打開一個鏡像站點，然后以此打開 /dists/xenial/main/ ，看這個目錄下面有沒有 binary-arm 這樣的字眼，如果有，就是提供arm支持的
上面部分來自https://blog.csdn.net/wr132/article/details/56700479
可參考該網址：https://mirror.tuna.tsinghua.edu.cn/help/raspbian/
https://zhuanlan.zhihu.com/p/35017671
下面貼出具體的代碼：

## Note, this file is written by cloud-init on first boot of an instance ## modifications made here will not survive a re-bundle. ## if you wish to make changes you can: ## a.) add 'apt_preserve_sources_list: true' to /etc/cloud/cloud.cfg ## or do the same in user-data ## b.) add sources in /etc/apt/sources.list.d ## c.) make changes to template file /etc/cloud/templates/sources.list.tmpl# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial main restricted deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial main restricted## Major bug fix updates produced after the final release of the ## distribution. deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-updates main restricted deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-updates main restricted## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team. Also, please note that software in universe WILL NOT receive any ## review or updates from the Ubuntu security team. deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial universe deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial universe deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-updates universe deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-updates universe## N.B. software from this repository is ENTIRELY UNSUPPORTED by the Ubuntu ## team, and may not be under a free licence. Please satisfy yourself as to ## your rights to use the software. Also, please note that software in ## multiverse WILL NOT receive any review or updates from the Ubuntu ## security team. deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial multiverse deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-updates multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-updates multiverse## N.B. software from this repository may not have been tested as ## extensively as that contained in the main release, although it includes ## newer versions of some applications which may provide useful features. ## Also, please note that software in backports WILL NOT receive any review ## or updates from the Ubuntu security team. deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-backports main restricted universe multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-backports main restricted universe multiversedeb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security main restricted deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security main restricted deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security universe deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security universe deb http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security multiverse deb-src http://mirrors.ustc.edu.cn/ubuntu-ports xenial-security multiverse## Uncomment the following two lines to add software from Canonical's ## 'partner' repository. ## This software is not part of Ubuntu, but is offered by Canonical and the ## respective vendors as a service to Ubuntu users. # deb http://archive.canonical.com/ubuntu xenial partner # deb-src http://archive.canonical.com/ubuntu xenial partner

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