update ubuntu package problem (10.04.2 LTS)

[NoOp]

On 05/10/2011 08:44 AM, Peng Yu wrote:
> On Mon, May 9, 2011 at 6:27 PM, NoOp <glgxg at sbcglobal.net> wrote:
>> On 05/09/2011 12:12 PM, Peng Yu wrote:
>>> Hi,
>>>
>>> I try to update my ubuntu. But I got the following error. Could you
>>> please let me know what the problem is and how to fix it?
>>>
>>
>> Have you tried:
>>
>> $ sudo dpkg --configure -a
>> and
>> $ sudo apt-get install -f
>> yet?
> 
> Here are the screen output.
> 
> $ sudo dpkg --configure -a
> Setting up dbus (1.2.16-2ubuntu4.2) ...
> The system user `messagebus' already exists. Exiting.
> chown: invalid group: `root:messagebus'
> dpkg: error processing dbus (--configure):
>  subprocess installed post-installation script returned error exit status 1
...
In the future, when you have lengthy output to post, please post at
http://paste.ubuntu.com and then provide a link to the pastebin: example:
http://paste.ubuntu.com/605802/

What is the result of the following:

$ groups root
$ groups messagebus
$ cat /etc/group
(only the root and messagebus output please or the entire on pastebin)