I did apt-get dist-upgrade and then apt-get update

Still , I have the same error , "Su returned with an error " in KDE 3.5 HD install

I'm running kernel 2.6.18 as I had to use the driver for my Nvidia Gefoce2 MX 200 card

Can anyone tell me how i can get rid of this error and use administrator mode in KDE ?

I can work in super user mode SU in the bash shell but not in the graphical menus of KDE.
Did anyone has the same problem?

if i type sudo in the bash shell , i get the following:

bladerunner@andromeda:~$ sudo
sudo: /etc/sudoers is owned by uid 1000, should be 0

Please let me know if you can suggest anything.
Thanks in advance