Thanks Julius, your solution helped me, but I ran across one small issue when using this for a PXE install: the swap lvm from that volume group was in use by Debian.
I added a swapoff command to yours:
swapoff "/dev/$vg/swap"
I doubt all LVMs for swap are named "swap", it was the name for me.
The final command:
d-i partman/early_command string sh -c 'set -- $(vgs --rows --noheadings | head -n 1); for vg in "$@"; do swapoff "/dev/$vg/swap"; vgremove -f "$vg"; done; set -- $(pvs --rows --noheadings | head -n 1); for pv in "$@"; do pvremove -f "$pv"; done'
Zane