Recently, I change my software Repo source, My ubuntu is 14.04 in a virtualbox. I changet the source to aliyun

some code snippet is below

$ cat /etc/apt/sources.list
abbott@abbott-VirtualBox:/software/jeffy-vim-read$ cat /etc/apt/sources.list
deb http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main restricted universe multiverse


when I exec the update, it says:

W:Failed to fetch http://mirrors.aliyun.com/ubuntu/dists/ ... elease.gpg Connection failed [IP: 115.28.122.210 80]
But if I copy the link to Firefox， I can open and download the file, but the software & Update Center or the command line can't do update.

Could anyone help to figure out why this happens?

try to use the automatic setup,系统设置/软件和更新/Ubuntu软件/下载自/其他站点/选择最佳服务器 wait a moment,then 选择服务器/关闭 wait for the automatic setup, and try the "sudo apt-get update or sudo apt-get upgrade" again.

14.04啊，好像有问题一段时间了，不知道是网络还是啥问题，反正就是有问题就是了，解决方法么，先不update（其实好像连install也不行）

14.04的3年支持是不是快到时间了？

https://wiki.ubuntu.com/TrustyTahr/Rele ... troduction

Ubuntu 14.04 LTS will be supported for 5 years for Ubuntu Desktop, Ubuntu Server, Ubuntu Core, Kubuntu, Edubuntu, and Ubuntu Kylin.

All other flavours will be supported for 3 years.