Ubuntu 6.06 Install

[RootChaos]

Hi Guys

I have been getting the following error whilst trying to install Plesk on my new Ubuntu 6.06 Test Server :-

Selecting previously deselected package sitebuilder.
Unpacking sitebuilder (from .../sitebuilder_3.0.2-build06112310_all.deb) ...
Errors were encountered while processing:
/var/cache/apt/archives/psa-qmail_1.03-ubuntu6.06.build81061129.23_i386.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
ERROR: Install command execution failed
Errors just before:
- Can't execute package installation command

ERROR: Installation failed
root@plesk-test:~#



Any help would be much appreciated !


Regards

G Marais