Ubuntu 9 Install

1 For get a Fast Speed , I choose 163 as my apt-get mirror site.
  u can edit /etc/source.list, and replace it's content with following codes:

deb http://mirrors.163.com/ubuntu/ jaunty main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-security main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb http://mirrors.163.com/ubuntu/ jaunty-backports main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-security main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-updates main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-proposed main restricted universe multiverse
deb-src http://mirrors.163.com/ubuntu/ jaunty-backports main restricted universe multiverse

then type following command:(so that ubuntu can update source repos)

sudo apt-get update

When this update is closing to the end , I caught an error( didn't encounter this error on my work station PC),when on my laptop:

     
获取：4 http://mirrors.163.com jaunty/universe Packages [4757kB]                                                                                                           
下载 6366kB，耗时 1min 41s (62.6kB/s)                                                                                                                                      
正在读取软件包列表... 完成
W: GPG error: http://mirrors.163.com jaunty-updates Release: 下列签名无效： BADSIG 40976EAF437D05B5 Ubuntu Archive Automatic Signing Key <[email protected]>
W: 您可能需要运行 apt-get update 来解决这些问题

So I baidu this message ,then I searched this page, which said:

引用

如果仅仅你一个人用的话

大可以不必要去考虑这个问题


一般 还行 不错 很好 非常好

So I ignored this error message(But still want to know why)