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1.使用下面命令备份 /etc/apt/sources.list 文件,避免改错了，无法还原

cp /etc/apt/sources.list /etc/apt/sources.list.backup

2,在/etc/apt/sources.list 文件中， 如下位置 红色字体内容。

#deb cdrom:[Ubuntu 10.10 _Maverick Meerkat_ - Release i386 (20101007)]/ maverick main restricted
# See http://help.ubuntu.com/community/UpgradeNotes for how to upgrade to
# newer versions of the distribution.


deb http://us.archive.ubuntu.com/ubuntu/ maverick main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ maverick main restricted


## Major bug fix updates produced after the final release of the
## distribution.
##
deb http://mirrors.163.com/debian squeeze main non-free contrib
deb http://mirrors.163.com/debian squeeze-proposed-updates main contrib non-free
deb http://mirrors.163.com/debian-security squeeze/updates main contrib non-free


deb-src http://mirrors.163.com/debian squeeze main non-free contrib
deb-src http://mirrors.163.com/debian squeeze-proposed-updates main contrib non-free
deb-src http://mirrors.163.com/debian-security squeeze/updates main contrib non-free
##
deb http://us.archive.ubuntu.com/ubuntu/ maverick-updates main restricted
deb-src http://us.archive.ubuntu.com/ubuntu/ maverick-updates main restricted

3.然后在终端中，执行如下命令进行升级