Wheezy-preseed-partman

d-i partman-auto/method string lvm
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-lvm/confirm boolean true
d-i partman-lvm/confirm_nooverwrite boolean true
d-i partman-auto-lvm/new_vg_name string vg0
d-i partman-auto-lvm/guided_size string 12GB

d-i partman-auto/expert_recipe string                         \
      boot-root ::                                            \
              256 100 256 ext2                                \
                      $primary{ } $bootable{ }                \
                      method{ format } format{ }              \
                      use_filesystem{ } filesystem{ ext2 }    \
                      mountpoint{ /boot }                     \
                      options/noatime{ noatime }              \
              .                                               \
              10240 100 10240 ext4                            \
                      $defaultignore{ } $lvmok{ }             \
                      method{ format } format{ }              \
                      use_filesystem{ } filesystem{ ext4 }    \
                      mountpoint{ / }                         \
                      options/noatime{ noatime }              \
                      lv_name{ root }                         \
              .                                               \
              1024 1000 1024 linux-swap                        \
                      $defaultignore{ } $lvmok{ }             \
                      method{ swap } format{ }                \
                      lv_name{ swap }                         \
              .

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