1,最好用系统自带的apt源，我用163的源升级没有成功
tao@tao-desktop:~$ grep -v ^# /etc/apt/sources.list|grep -v ^$
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 http://security.ubuntu.com/ubuntu precise-security main restricted
deb-src http://security.ubuntu.com/ubuntu precise-security main restricted
deb http://security.ubuntu.com/ubuntu precise-security universe
deb-src http://security.ubuntu.com/ubuntu precise-security universe
deb http://security.ubuntu.com/ubuntu precise-security multiverse
deb-src http://security.ubuntu.com/ubuntu precise-security multiverse
deb precise partner
2，开始更新
tao@tao-desktop:~$ sudo update-manager -d
弹出更新管理器，发现有新的版本12.04LTS,双击升级即可
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