ubuntu无法启动 找不到/dev/sda*

[LOp]

upgrade 8.10 to 9.04
diaplay Alert ********does not exist.Dropping to a shell.
I try to solve the problem. Use live CD
my fstab file:
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/sda8
UUID=9ee12aa1-78cf-4649-a887-a3b74fb5d10c / ext3 relatime,errors=remount-ro 0 1
# /dev/sda1
UUID=e43e2e5a-5f68-4894-82b2-e2977fd68070 /boot ext3 relatime 0 2
# /dev/sda6
UUID=7577aa9a-8db9-41e5-8518-213094e3031e /home ext3 relatime 0 2
# /dev/sda9
UUID=53cce439-c214-4ff8-8c1f-e119fd365ca9 /usr ext3 relatime 0 2
# /dev/sda7
UUID=2f244e6a-b526-4541-9752-e4142d53cfd4 /var ext3 relatime 0 2
# /dev/sda5
UUID=f8c37bf5-32ae-4fcf-a8dd-079f1333ea0f none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0


my menu.lst file:
## ## End Default Options ##

title Ubuntu 8.10, kernel 2.6.27-7-generic
uuid e43e2e5a-5f68-4894-82b2-e2977fd68070
root (hd0,0)
kernel /vmlinuz-2.6.27-7-generic rootdelay=90 root=/dev/sda8 ro quiet splash
initrd /initrd.img-2.6.27-7-generic
quiet

title Ubuntu 8.10, kernel 2.6.27-7-generic (recovery mode)
uuid e43e2e5a-5f68-4894-82b2-e2977fd68070
kernel /vmlinuz-2.6.27-7-generic root=UUID=9ee12aa1-78cf-4649-a887-a3b74fb5d10c ro single
initrd /initrd.img-2.6.27-7-generic

title Ubuntu 8.10, memtest86+
uuid e43e2e5a-5f68-4894-82b2-e2977fd68070
kernel /memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST

最主要的问题is /dev 目录内的sda*文件消失了
但是可以在live cd 中用mount /dev/sda1 /mnt/boot 等命令挂载分区
有什么办法 可以重建 sda* (保留原分区文件)
因为use live cd所以只能用特殊方法打中文可能有点乱 见谅~
help me please~!

[LOp]

solved by myshelf~!