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    【树莓派】为Ubuntu for ARM 更换中国软件源

    更换步骤
    以root身份打开 /etc/apt/sources.list ,至于用什么打开随意
    http://ports.ubuntu.com/ 全部替换为 http://mirrors.ustc.edu.cn/ubuntu-ports/ ,这是中科大的
    执行 sudo apt-get update 和 sudo apt-get upgrade 测试

    查看是否提供arm支持的方法

    打开一个镜像站点,然后以此打开 /dists/xenial/main/ ,看这个目录下面有没有 binary-arm 这样的字眼,如果有,就是提供arm支持的
    上面部分来自https://blog.csdn.net/wr132/article/details/56700479
    下面贴出具体的代码:

    ## 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 multiverse
    
    deb 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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