create usb:
dd if=ubuntu.iso of=/dev/sdx bs=2048
when inside ubuntu-live, install lvm2 and mount or create vg, lv.
apt-get install lvm2
modprobe dm-mod
partprobe
choose file system folders and install ubuntu.
chroot to newly created system and install lvm2
<code>
root@ubuntu:/home/ubuntu# mount /dev/vg00/lvroot /mnt/
root@ubuntu:/home/ubuntu# mount /dev/sda1 /mnt/boot
root@ubuntu:/home/ubuntu# mount /dev/vg00/lvvar /mnt/var
root@ubuntu:/home/ubuntu# mount /dev/vg00/lv_tmp /mnt/tmp
root@ubuntu:/home/ubuntu# mount -o bind /dev /mnt/dev
root@ubuntu:/home/ubuntu# mount -o bind /sys /mnt/sys
root@ubuntu:/home/ubuntu# mount -t proc none /mnt/proc
</code>