具體操作如下：
首先，最好備份下原來(lái)的源文件：
代碼:
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
然后，編輯原來(lái)的源文件：
代碼:
sudo gedit /etc/apt/sources.list
然后，將文件里的內容全部刪除，替換為以下源：
代碼:
#網(wǎng)易（速度很快）
#代碼:
deb http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse
deb-src http://mirrors.163.com/ubuntu/ lucid main universe restricted multiverse
deb http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-security universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-proposed universe main multiverse restricted
deb http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-backports universe main multiverse restricted
deb-src http://mirrors.163.com/ubuntu/ lucid-updates universe main multiverse restricted
最后保存退出，保存后輸入下面的指令刷新源信息：
代碼:
sudo apt-get update
然后輸入：
代碼:
sudo apt-get upgrade
就可以進(jìn)行系統升級了。
