Cat/etc/apt/sources.list
Debhttp://mirrors.sohu.com/ubuntu/Precise main restricted universe multiverse
Debhttp://mirrors.sohu.com/ubuntu/Precise-security Main restricted Universe multiverse
Debhttp://mirrors.sohu.com/ubuntu/Precise-updates Main restricted Universe multiverse
Debhttp://mirrors.sohu.com/ubuntu/ precise-backports main restricted universe Multiverse
Deb-src http://mirrors.sohu.com/ubuntu/ Precise main restricted universe Multiverse
Deb-src http:// Mirrors.sohu.com/ubuntu/ precise-security main restricted universe Multiverse
Deb-src http://mirrors.sohu.com/ubuntu/ precise-updates main restricted universe multiverse
Deb-src http://mirrors.sohu.com/ubuntu/ Precise-backports main restricted universe Multiverse
==================
source.list_163: #改成一下内容
- Deb http://mirrors.163.com/ubuntu/ precise main universe restricted multiverse
- DEB-SRC http://mirrors.163.com/ubuntu/ Precise main universe restricted multiverse
- Deb http://mirrors.163.com/ubuntu/ precise-security Universe main Multiverse restricted
- DEB-SRC http://mirrors.163.com/ubuntu/ precise-security Universe main Multiverse restricted
- Deb http://mirrors.163.com/ubuntu/ precise-updates Universe main Multiverse restricted
- Deb http://mirrors.163.com/ubuntu/ precise-backports Universe main Multiverse restricted
- DEB-SRC http://mirrors.163.com/ubuntu/ precise-backports Universe main Multiverse restricted
- DEB-SRC http://mirrors.163.com/ubuntu/ precise-updates Universe main Multiverse restricted
========================
sudo apt-get update
sudo apt-get dist-upgrade
Ubuntu Update Source Kernel upgrade