进入apt目录，备份原来的源地址

cd /etc/apt
mv ./source.list ./source.list.bak

 

 

修改源文件source.list

vim source.list

 

更换阿里云源

deb http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe 
deb http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe 
deb http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe 
deb http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe 
deb http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe 
deb-src http://mirrors.aliyun.com/ubuntu/ trusty main multiverse restricted universe 
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-backports main multiverse restricted universe 
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-proposed main multiverse restricted universe 
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-security main multiverse restricted universe 
deb-src http://mirrors.aliyun.com/ubuntu/ trusty-updates main multiverse restricted universe

 :wq 保存退出即可

 

更新源

sudo apt-get update

 

也可以全局更新

sudo apt-get upgrade

但这个很耗时，执行上面那一条就可以了