1, It is best to use the apt source that comes with the system, I used the 163 source to upgrade without success
tao@tao-desktop:~$ grep -v ^# /etc/apt/sources.list|grep -v ^$
deb http://cn.archive.ubuntu.com/ubuntu/ precise main restricted
deb-src http://cn.archive.ubuntu.com/ubuntu/ precise main restricted
deb http://cn.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-updates main restricted
deb http://cn.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://cn.archive.ubuntu.com/ubuntu/ precise universe
deb http://cn.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://cn.archive.ubuntu.com/ubuntu/ precise-updates universe
deb http://cn.archive.ubuntu.com/ubuntu/ precise multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ precise multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ precise-updates multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu/ 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 http://archive.canonical.com/ precise partner
2 ,Start Update
tao@tao-desktop:~$ sudo update-manager -d
Pop up the update manager, find a new version 12.04LTS, double-click to upgrade
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