linux系统下切换源

备份

sudo cp /etc/apt/sources.list /etc/apt/sources.list_backup
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打开软件源列表文件

sudo vim /etc/apt/sources.list
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或者

sudo gedit /etc/apt/sources.list
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删除文件中所有内容，直接替换源，这里推荐阿里源，内容如下：
阿里源：

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 
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清华源在此提供链接自取

保存后就可以开始更新软件列表信息了，输入以下指令

sudo apt-get update
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update后，可能需要upgrade一下

sudo apt-get upgrade
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如果使用apt命令去下载文件出错时，可以尝试切换源