sudo problem after resetting root password

[yorlick kilroy]

Hi,

after losing (forgetting) my root (sudo) password, I used the Kubuntu live
CD to delete the "!" from the shadow file for the root entry. After
rebooting Kubuntu from harddisk I was able to reset the password by using
the console login and logging in as root and typing in passwd. However now I
cant do the "sudo" thing anymore. I keep getting a permission denied. The
funny thing is that now I am able to login as root in console mode or by
typing in "su" from another account.
Does anyone know how I can fix the broken "sudo" feature?

-- Joe
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