这是我的预置文件：
d-i partman-auto/disk string /dev/sda
d-i partman-auto/method string lvm
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-lvm/device_remove_lvm_span boolean true
d-i partman-auto/purge_lvm_from_device boolean true
d-i partman-auto-lvm/guided_size string max
d-i partman-md/device_remove_md boolean true
d-i partman-auto-lvm/new_vg_name string vg0
d-i partman/alignment select cylinder
d-i partman-auto/choose_recipe select boot-root
d-i partman-auto/expert_recipe string \
boot-root :: \
256 8000 256 ext2 \
$primary{ } \
$bootable{ } \
method{ format } \
format{ } \
use_filesystem{ } \
filesystem{ ext2 } \
mountpoint{ /boot } . \
30000 7000 1000000000 ext4 \
$primary{ } \
$defaultignore{ } \
method{ lvm } \
device{ /dev/sda } \
vg_name{ vg0 } . \
30000 5000 1000000000 ext4 \
$lvmok{ } \
in_vg{ vg0 } \
lv_name{ root } \
method{ format } \
format{ } \
use_filesystem{ } \
filesystem{ ext4 } \
mountpoint{ / } . \
256 6000 512 swap \
$lvmok{ } \
in_vg{ vg0 } \
lv_name{ swap } \
method{ swap } \
format{ } . \
d-i partman/default_filesystem string ext4
d-i partman-partitioning/confirm_write_new_label boolean true
d-i partman/choose_partition select finish
d-i partman-md/confirm boolean true
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/confirm boolean true
d-i partman-lvm/confirm_nooverwrite boolean true
那么为什么安装程序会完全忽略它并选择这样做：
--- Logical volume ---
LV Name /dev/vg0/root
VG Name vg0
LV UUID Y8CeAF-SzBy-A3V3-Wvhw-UB0r-r1oE-8sTTuc
LV Write Access read/write
LV Status available
# open 1
LV Size 1.76 GiB
Current LE 450
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:0
--- Logical volume ---
LV Name /dev/vg0/swap_1
VG Name vg0
LV UUID 63CL5Q-UDAq-zDtn-VrY0-I638-uZ1D-XSkm8E
LV Write Access read/write
LV Status available
# open 2
LV Size 8.00 GiB
Current LE 2048
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 252:1