su/kdesu not working

[Roberto Ragusa]

Dj YB wrote:
> I am sorry to have to post this problem to the list, but I got no answer in 
> the forum, and couldn't find one elsewere.
> 
> I can login as root.
> when trying to su to root using "su" or "su -" i get "su: incorrect password"
> following some threads I added my user to the "wheel" group and tried to edit 
> /etc/sudoers using visudo with no luck on both.
> also tried to edit "/etc/pam.d/su" again with no luck.
> I really need a solution since many operations can't be done without su 
> normally.

Big hammer:
  strace -f su -

It will print a lot of stuff, maybe you will find something (in the
last lines near the password rejection, if you are lucky).
If some PAM module is involved, you may discover which one.

-- 
   Roberto Ragusa    mail at robertoragusa.it