I setup whole disk encryption with the alternative installer on 12.04, and it seems to have gone with using an encrypted partition rather than an LVM.

If I follow the guide at:

None of the VG commands do anything. All I'm left with after I initialize the disk is a device /dev/mapper/sda2_crypt. I can mount that and happily see my filesystem (though oddly, fdisk doesn't report anything on it).

I have 3 partitions - sda1 which is boot, sda2 which is my luks partition, and then sda3 which is a partition I had intended to use for windows, and am deciding to just merge it with my linux partition.

I feel I have to enlarge the sda2 partition, then enlarge the crypt of it? That's where I get lost.

Help Please?!