首先開啟終端，用root登陸。切換到/etc/apt/目錄下，執行：cd /apt/get/，如圖：將裡面的sources.list複製一下，為了安全。如圖：接下來就是用vim 開啟 sources.list，將裡面的原有的內容刪除（知道為什麼之前要複製了吧），然後新增如下內容：deb

http://mirrors.163.com/ubuntu/

trusty main restricted universe multiversedeb

http://mirrors.163.com/ubuntu/

trusty-security main restricted universe multiversedeb

http://mirrors.163.com/ubuntu/

trusty-updates main restricted universe multiversedeb

http://mirrors.163.com/ubuntu/

trusty-proposed main restricted universe multiversedeb

http://mirrors.163.com/ubuntu/

trusty-backports main restricted universe multiversedeb-src

http://mirrors.163.com/ubuntu/

trusty main restricted universe multiversedeb-src

http://mirrors.163.com/ubuntu/

trusty-security main restricted universe multiversedeb-src

http://mirrors.163.com/ubuntu/

trusty-updates main restricted universe multiversedeb-src

http://mirrors.163.com/ubuntu/

trusty-proposed main restricted universe multiversedeb-src

http://mirrors.163.com/ubuntu/

trusty-backports main restricted universe multiverse5最後執行：apt-get update就好了。：