Ubuntu armhf版本的源网址不同于普通Ubuntu系统，如果采用如下网址会出现问题，导致sudo apt-get update出现Error。

之前的连接：

 deb http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse

deb http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

deb-src http://archive.ubuntu.com/ubuntu/ trusty main restricted universe multiverse

deb-src http://archive.ubuntu.com/ubuntu/ trusty-security main restricted universe multiverse

deb-src http://archive.ubuntu.com/ubuntu/ trusty-updates main restricted universe multiverse

deb-src http://archive.ubuntu.com/ubuntu/ trusty-proposed main restricted universe multiverse

deb-src http://archive.ubuntu.com/ubuntu/ trusty-backports main restricted universe multiverse

应该要采用如下网址：

 deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty main multiverse restricted universe

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-backports main multiverse restricted universe

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-proposed main multiverse restricted universe

deb http://mirrors.ustc.edu.cn/ubuntu-ports trusty-security main multiverse restricted universe

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-updates main multiverse restricted universe

deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty main multiverse restricted universe

deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-backports main multiverse restricted universe

deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-proposed main multiverse restricted universe

deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-security main multiverse restricted universe

deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ trusty-updates main multiverse restricted universe

具体更新方法如下，首先打开shell，输入：

cd /etc/apt

cp sources.list sources.list.backup

sudo gedit sources.list

删除文件中所有文字，将上面的网址复制到sources.list中，保存并退出。之后输入：

sudo apt-get update

等待更新结束即可。

//树莓派 Ubuntu mate 更新源

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial main multiverse restricted universe

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

deb http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial-proposed main multiverse restricted universe

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

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

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

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

deb-src http://mirrors.ustc.edu.cn/ubuntu-ports/ xenial-proposed main multiverse restricted universe

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

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

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