How can I install one standart Xu with one encrypted LVM XU ?

[mahesh]

Hi.
I Need 2 versions of Xubuntu on my workstation (MSI Cubi N JSL with N6000 proc, if that matters).
One everyday installation for everyone in the familly, and one encrypted for sensitive work.
Installing one of both is easy, but i don't know how to install the other to be able to choose the one I want when booting.
How should I organize my partitions ?
Thanks.