請問Ubuntu 無人職守安裝 - Linux

下面是我preseed.cfg內容

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-md/device_remove_md boolean true
d-i partman-lvm/confirm boolean true
d-i partman-auto-lvm/new_vg_name string CSIEHadoop
d-i partman-auto-lvm/guided_size string max
d-i partman-auto/expert_recipe string \
boot-root :: \
200 50 200 ext2 \
$primary{ } $bootable{ } \
method{ format } format{ } \
use_filesystem{ } filesystem{ ext2 } \
mountpoint{ /boot } \
. \
3072 10000 3072 ext4 method{ lvm } \
$lvmok{ } method{ format } format{ } \
use_filesystem{ } filesystem{ ext4 } \
mountpoint{ / } \
. \
3072 10000 1000000000 ext4 method{ lvm } \
$lvmok{ } method{ format } format{ } \
use_filesystem{ } filesystem{ ext4 } \
mountpoint{ /var/lib/hadoop } \
. \
1024 1024 1024 linux-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/confirm boolean true
d-i partman/confirm_nooverwrite boolean true
d-i partman-lvm/confirm_nooverwrite boolean true
d-i partman-lvm/confirm boolean true
d-i partman-lvm/device_remove_lvm boolean true
d-i partman-lvm/confirm_nooverwrite boolean true


請問 到底還有什麼選項可能造成

No root file system
No root file system is defined.

Please correct this from the partitioning menu.

系統是Ubuntu 12.04
Installation boot by PXE
更奇怪的是 我重開機 再次用同樣步驟安裝 就會成功
機率大概50%會發生
很怪
不知道有沒有版友有類似經驗
謝謝

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