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I am not sure if it still the case, but I remember on some distros of Linux, when deleting a user account, it gave the same generic error (user exists) for three conditions. The first was that they were in the passwd file, the second if they were in the shadow or group files, and lastly if the home directory existed. I dont suppose you have the users home directories still there?
-- Paul Gear Manager IT Operations Redlands College 38 Anson Road, Wellington Point 4160 07 3286 0271 (Please send attachments in portable formats such as PDF or HTML.)