?xml version="1.0" encoding="UTF-8"?
1、复制原文件备份
sudo cp /etc/apt/source.list /etc/apt/source.list.bak
2、编辑源列表文件
sudo vim /etc/apt/source.list
3、将原来的列表删除，添加如下内容
debhttp://mirrors.aliyun.com/ubuntu/vivid main restricted universe multiverse
debhttp://mirrors.aliyun.com/ubuntu/vivid-security main restricted universe multiverse
debhttp://mirrors.aliyun.com/ubuntu/vivid-updates main restricted universe multiverse
debhttp://mirrors.aliyun.com/ubuntu/vivid-proposed main restricted universe multiverse
debhttp://mirrors.aliyun.com/ubuntu/vivid-backports main restricted universe multiverse
deb-srchttp://mirrors.aliyun.com/ubuntu/vivid main restricted universe multiverse
deb-srchttp://mirrors.aliyun.com/ubuntu/vivid-security main restricted universe multiverse
deb-srchttp://mirrors.aliyun.com/ubuntu/vivid-updates main restricted universe multiverse
deb-srchttp://mirrors.aliyun.com/ubuntu/vivid-proposed main restricted universe multiverse
deb-srchttp://mirrors.aliyun.com/ubuntu/vivid-backports main restricted universe multiverse
4、运行sudo apt-get update
5、运行sudo apt-get upgrade
