ubuntu修改軟件源的方法：1、打開終端；2、輸入“sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup”命令備份源列表；3、輸入“sudo vim /etc/apt/sources.list”命令打開sources.list文件進行修改；4、使用新的源替換掉文件中所有的內容；5、輸入命令更新源列表，使修改生效即可。

具體操作步驟：

1、使用快捷鍵【Ctrl+Alt+T】打開終端。

2、輸入以下命令備份源列表。

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

3、再輸入命令打開sources.list文件進行修改。

sudo vim /etc/apt/sources.list

4、使用以下源替換掉文件中所有的內容，保存編輯好的文件。

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、最后輸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