2 problems with nessus

[Jim]

First problem is i cannot update my nessus from 2.06 to 2.07.   This is the error i'm getting. From install-nessus.sh.   x - creating lock directory x - extracting nessus.tar.gz (binary) x - now extracting this archive tar: invalid option -- a Try `tar --help' for more information.   And how do i get nessus-update-plugins working ?   I'm running debian woody.   thanks