1、备份ubuntu7.10 /etc/apt/sources.list文件。
我的sources.list文件内容为：
deb http://cn.archive.ubuntu.com/ubuntu dapper main restricted universe multiver
se
deb http://cn.archive.ubuntu.com/ubuntu dapper-security main restricted universe
multiverse
deb http://cn.archive.ubuntu.com/ubuntu dapper-updates main restricted universe
multiverse
# deb http://cn.archive.ubuntu.com/ubuntu dapper-backports main restricted unive
rse multiverse
deb http://mirror.lupaworld.com/ubuntu/ubuntu-cn dapper main restricted universe
multiverse
deb http://security.ubuntu.com/ubuntu dapper-security main restricted universe m
ultiverse
deb-src http://cn.archive.ubuntu.com/ubuntu dapper main restricted universe mult
iverse
deb-src http://cn.archive.ubuntu.com/ubuntu dapper-security main restricted univ
erse multiverse
deb-src http://cn.archive.ubuntu.com/ubuntu dapper-updates main restricted unive
rse multiverse
字串4
# deb-src http://cn.archive.ubuntu.com/ubuntu dapper-backports main restricted u
niverse multiverse
deb http://cn.archive.ubuntu.com/ubuntu/ gutsy main universe restricted multiver
se
deb-src http://cn.archive.ubuntu.com/ubuntu/ gutsy main universe restricted mult
iverse
deb http://security.ubuntu.com/ubuntu/ gutsy-security universe main multiverse r
estricted
deb-src http://security.ubuntu.com/ubuntu/ gutsy-security universe main multiver
se restricted
deb http://cn.archive.ubuntu.com/ubuntu/ gutsy-updates universe main multiverse
restricted
deb-src http://cn.archive.ubuntu.com/ubuntu/ gutsy-updates universe main multive
rse restricted
deb http://cn.archive.ubuntu.com/ubuntu/ gutsy-proposed universe main multiverse
restricted
deb-src http://cn.archive.ubuntu.com/ubuntu/ gutsy-proposed universe main multiv
erse restricted
deb-src http://security.ubuntu.com/ubuntu dapper-security main restricted univer
se multiverse 字串1
#deb http://ppa.launchpad.net/kubuntu-members-kde4/ubuntu gutsy main
2、使用sudo gedit /etc/apt/sources.list 修改sources.list文件，将gutsy修改hardy。gutsy是ubuntu 7.10的开发代号，hardy是ubuntu 8.0开发代号。
3、然后启用系统－》系统管理－》更新管理器，使用部分升级进行升级。大概600多M，慢慢升吧。
4、升级后重新启动系统，ok。