Force remove existing LVM data

debi.sh

@@ -791,6 +791,7 @@ d-i partman-partitioning/confirm_write_new_label boolean true
 d-i partman/choose_partition select finish
 d-i partman/confirm boolean true
 d-i partman/confirm_nooverwrite boolean true
+d-i partman-lvm/device_remove_lvm boolean true
 EOF
 }