1.首先備份ubuntu源列表;
sudo cp /etc/apt/sources.list /etc/apt/sources.list.backup （備份下當前的源列表）
2.修改更新源；
sudo vim /etc/apt/sources.list
3.刪除更新源中的資料；
300dd
上面命令的意思是刪除游標以下300行的內容，這個300可根據自己的情況修改要刪除的行數；
4.複製更新源；
在vim中按i字幕後複製貼上163或sohu的源；
163源
deb precise main restricted
deb-src precise main restricted
deb precise-updates main restricted
deb-src precise-updates main restricted
deb precise universe
deb-src precise universe
deb precise-updates universe
deb-src precise-updates universe
deb precise multiverse
deb-src precise multiverse
deb precise-updates multiverse
deb-src precise-updates multiverse
deb precise-backports main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb precise-security main restricted
deb-src precise-security main restricted
deb precise-security universe
deb-src precise-security universe
deb precise-security multiverse
deb-src precise-security multiverse
deb precise main
deb-src precise main
sohu源
deb precise main restricted
deb-src precise main restricted
deb precise-updates main restricted
deb-src precise-updates main restricted
deb precise universe
deb-src precise universe
deb precise-updates universe
deb-src precise-updates universe
deb precise multiverse
deb-src precise multiverse
deb precise-updates multiverse
deb-src precise-updates multiverse
deb precise-backports main restricted universe multiverse
deb-src precise-backports main restricted universe multiverse
deb precise-security main restricted
deb-src precise-security main restricted
deb precise-security universe
deb-src precise-security universe
deb precise-security multiverse
deb-src precise-security multiverse
deb precise main
deb-src precise main
上面兩個用其中乙個就可以了
然後按esc鍵 輸入:wq 儲存退出；
5.執行命令 sudo apt-get update
如果報錯 則輸入 sudo rm /var/lib/apt/lists/*-rf
再執行sudo apt-get update
然後執行sudo apt-get upgrade
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