(A)Prepare:
install virtualbox,
setup a new virtual machine in virtualbox,
install ubuntu inside that virtual machine,
install the file attached here into that ubuntu,
(that file installs all packages that ehcp needs, as of 11-2010 )
go to vitualbox, snapshots->take snapshot of virtual machine

this way, you will have a running ubuntu, with all packages needed by ehcp.
and you have a snapshot of that ubuntu, so that you will be able to rollback any changes that is made after this point to that snapshot, and you will be able to test ehcp frequently.

(B)from this point :
just download and install ehcp normally, test it.. do whatever you want.

whenever you want to test it from scratch,
just click on virtualbox, that snapshot, click restore,

you will have a new clean install of ubuntu, with all packages installed, no need to download all packages (saves your internet conn.)

to continue, go to step B

this post also was like a program ! :) we are programmers...