I really can't say how this happened but my permissions seem to be totally messed up (Leopard, MB C2D). How do I know? 1. When I try to use "sudo" in a terminal I get this error Code: sudo: must be setuid root 2. When I try to repair permissions in Disk Utility I get this error Code: The underlying task reported failure on exit. 3. Despite being a member of the Admin group, I am unable to make any change whatsoever to Sharing & Permissions for Macintosh HD. I cannot eliminate or change a user permission from Read to Read&Write and I cannot take out a user or group. I have tried for some time to get out of this, but to date, nothing has worked. I have even considered a re-install, but as I am multibooting a few Linux OSes, all of these would have to be removed before I can re-install Leopard Any ideas as to how I might overcome this problem?