Improving, but not quite there yet. I boot from VE iso, break to a prompt, config simple network to get access to the world and then do this:
$ vgchange -a y pve
$ mkdir /tmp/a; mount /dev/pve/root /tmp/a
$ mount -o bind /sys /tmp/a/sys; mount -o bind /dev /tmp/a/dev; mount -o bind /proc...