为什么我没法在 Ubuntu14.04 上通过 apt-get 安装软件？

背景：在一台旧 Android 手机（系统版本 4.0 ）上通过终端模拟器安装了 Ubuntu14.04 ，切换了安装源为 163 的。

1、系统信息：

root@localhost:~# cat /etc/issue Ubuntu Trusty Tahr (development branch) \n \l 

2、切换源以后，update 后出现很多 404 和 failed：

root@localhost:~# sudo apt-get update Ign http://mirrors.163.com trusty InRelease Get:1 http://mirrors.163.com trusty-security InRelease [65.9 kB] Get:2 http://mirrors.163.com trusty-updates InRelease [65.9 kB] Get:3 http://mirrors.163.com trusty-proposed InRelease [65.9 kB] Hit http://mirrors.163.com trusty-backports InRelease Hit http://mirrors.163.com trusty Release.gpg Get:4 http://mirrors.163.com trusty-security/main Translation-en [347 kB] Get:5 http://mirrors.163.com trusty-security/multiverse Translation-en [2201 B] Get:6 http://mirrors.163.com trusty-security/restricted Translation-en [3491 B] Get:7 http://mirrors.163.com trusty-security/universe Translation-en [103 kB] Get:8 http://mirrors.163.com trusty-updates/main Translation-en [493 kB] Get:9 http://mirrors.163.com trusty-updates/multiverse Translation-en [7430 B] Get:10 http://mirrors.163.com trusty-updates/restricted Translation-en [3978 B] Get:11 http://mirrors.163.com trusty-updates/universe Translation-en [225 kB] Get:12 http://mirrors.163.com trusty-proposed/main Translation-en [21.4 kB] Get:13 http://mirrors.163.com trusty-proposed/multiverse Translation-en [28 B] Get:14 http://mirrors.163.com trusty-proposed/restricted Translation-en [281 B] Get:15 http://mirrors.163.com trusty-proposed/universe Translation-en [10.3 kB] Hit http://mirrors.163.com trusty-backports/main Translation-en Hit http://mirrors.163.com trusty-backports/multiverse Translation-en Hit http://mirrors.163.com trusty-backports/restricted Translation-en Hit http://mirrors.163.com trusty-backports/universe Translation-en Hit http://mirrors.163.com trusty Release Hit http://mirrors.163.com trusty/main Translation-en Hit http://mirrors.163.com trusty/multiverse Translation-en Hit http://mirrors.163.com trusty/restricted Translation-en Hit http://mirrors.163.com trusty/universe Translation-en Err http://mirrors.163.com trusty-security/main armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-security/restricted armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-security/universe armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-security/multiverse armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-updates/main armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-updates/restricted armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-updates/universe armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-updates/multiverse armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-proposed/main armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-proposed/restricted armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-proposed/universe armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-proposed/multiverse armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-backports/main armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-backports/restricted armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-backports/universe armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty-backports/multiverse armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty/main armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty/restricted armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty/universe armhf Packages 404 Not Found [IP: 123.58.190.236 80] Err http://mirrors.163.com trusty/multiverse armhf Packages 404 Not Found [IP: 123.58.190.236 80] Fetched 1414 kB in 6min 23s (3685 B/s) W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-security/main/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-security/restricted/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-security/universe/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-security/multiverse/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-updates/main/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-updates/restricted/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-updates/universe/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-updates/multiverse/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-proposed/main/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-proposed/restricted/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-proposed/universe/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-proposed/multiverse/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-backports/main/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-backports/restricted/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-backports/universe/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty-backports/multiverse/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty/main/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty/restricted/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty/universe/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] W: Failed to fetch http://mirrors.163.com/ubuntu/dists/trusty/multiverse/binary-armhf/Packages 404 Not Found [IP: 123.58.190.236 80] E: Some index files failed to download. They have been ignored, or old ones used instead. 

3、安装任意软件，提示如下：

root@localhost:~# sudo apt-get install Nginx Reading package lists... Done Building dependency tree Reading state information... Done E: Unable to locate package Nginx 

请问各位大神，如何处理是好？