这是我的预置文件：
di partman-auto/disk string /dev/sda di partman-auto/method string lvm di partman-lvm/device_remove_lvm boolean true di partman-lvm/device_remove_lvm_span boolean true di partman-auto/purge_lvm_from_device boolean true di partman-auto-lvm/guided_size string max di partman-md/device_remove_md boolean true di partman-auto-lvm/new_vg_name string vg0 di partman/alignment select cylinder di partman-auto/choose_recipe select boot-root di 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{ } . \ di partman/default_filesystem string ext4 di partman-partitioning/confirm_write_new_label boolean true di partman/choose_partition select finish di partman-md/confirm boolean true di partman-partitioning/confirm_write_new_label boolean true di partman/choose_partition select finish di partman/confirm boolean true di partman/confirm_nooverwrite boolean true di partman-lvm/confirm boolean true di partman-lvm/confirm_nooverwrite boolean true 那么为什么安装程序完全忽略它，而是select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