1. 备份之前的源
sudo cp /etc/apt/sources.list /etc/apt/sources_init.list
2. 更换源
编译源文件，将所需的源编辑进去，以阿里源为例
sudo gedit /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
3. 更新
更新源
sudo apt-get update
更新软件
sudo apt-get upgrade
来源：CSDN
作者：桃子小迷妹
链接：https://blog.csdn.net/weixin_43846270/article/details/103827644