美国云服务器的ubuntu在sources.list文件中进行修改镜像源，修改方法：1、打开终端；2、输入“sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup”命令备份源列表；3、输入“sudo vim /etc/apt/sources.list”命令打开sources.list文件进行修改；4、使用新的源替换掉文件中所有的内容；5、输入命令更新源列表，使修改生效即可。

具体操作步骤：

1、使用快捷键【Ctrl+Alt+T】打开终端。

2、输入以下命令备份源列表。

sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup

3、再输入命令打开sources.list文件进行修改。

sudo vim /etc/apt/sources.list

4、使用以下源替换掉文件中所有的内容，保存编辑好的文件。

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

5、最后输入以下命令更新源列表，使修改生效即可。

sudo apt-get update

sudo apt-get upgrade

sudo apt-get install build-essential