ubuntu 10.04无法顺利启动到桌面,只能进入BusyBox 系统

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近期因工作原因,在原双机(xp+ubuntu 10.04)基础增加Red Hat Enterprise Linux（RHEL) 5.3后,开机后就只有xp和Red Hat Enterprise Linux（RHEL) 5.3,在配置文件增加ubuntu内核后可以引导,但只能启动到 BusyBox 系统,busybox系统的版本为"BusyBox v1.13.3 (Ubuntu 1:1.13.3-1ubuntu11) built-in shell (ash)",无法启动到ubuntu的桌面,至今还找不到原因.

分区说明:
xp===c: ntfs
扩展:
d: fat32
/boot ---ubuntu-10.04
/ ---ubuntu-10.04
swap ---ubuntu-10.04和Red Hat Enterprise Linux（RHEL) 5.3共用
/boot --Red Hat Enterprise Linux（RHEL) 5.3
/ --Red Hat Enterprise Linux（RHEL) 5.3
/app --Red Hat Enterprise Linux（RHEL) 5.3(部署应用程序和数据库)

安装好Red Hat Enterprise Linux（RHEL) 5.3后启动配置文件:
[root@rhelas53 /]# more /boot/grub/grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You have a /boot partition. This means that
# all kernel and initrd paths are relative to /boot/, eg.
# root (hd0,8)
# kernel /vmlinuz-version ro root=/dev/hda11
# initrd /initrd-version.img
#boot=/dev/hda
default=1
timeout=5
splashimage=(hd0,8)/grub/splash.xpm.gz
hiddenmenu
title Red Hat Enterprise Linux Server (2.6.18-128.el5xen)
root (hd0,8)
kernel /xen.gz-2.6.18-128.el5 crashkernel=128M@16M
module /vmlinuz-2.6.18-128.el5xen ro root=LABEL=/ rhgb quiet
module /initrd-2.6.18-128.el5xen.img
title XP
rootnoverify (hd0,0)
chainloader +1
title Ubuntu10
root (hd0,5)
kernel /vmlinuz-2.6.32-21-generic
initrd /initrd.img-2.6.32-21-generic
[root@rhelas53 /]#

PC硬盘详细的分区信息:
[root@rhelas53 /]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/hda11 11G 3.0G 7.0G 30% /
/dev/hda10 12G 158M 11G 2% /app
/dev/hda9 99M 13M 82M 13% /boot
tmpfs 161M 0 161M 0% /dev/shm
none 161M 104K 161M 1% /var/lib/xenstored
/dev/hda6 92M 21M 67M 24% /tmp/hda6
/dev/hda7 29G 2.5G 25G 10% /tmp/hda7
[root@rhelas53 /]# fdisk -l

Disk /dev/hda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 1402 11261533+ 7 HPFS/NTFS
/dev/hda2 1403 9729 66886597 f W95 Ext'd (LBA)
/dev/hda5 1403 2804 11261533+ b W95 FAT32
/dev/hda6 2805 2817 97280 83 Linux
/dev/hda7 2817 6635 30667776 83 Linux
/dev/hda8 6635 6756 975872 82 Linux swap / Solaris
/dev/hda9 6757 6769 104391 83 Linux
/dev/hda10 6770 8327 12514603+ 83 Linux
/dev/hda11 8328 9729 11261533+ 83 Linux
[root@rhelas53 /]# blkid
/dev/hdc: LABEL="RHEL/5.3 i386 DVD" TYPE="iso9660"
/dev/hda11: LABEL="/" UUID="ab9862c0-d47a-4e75-9ea8-75e43cfa99e7" TYPE="ext3"
/dev/hda10: LABEL="/app" UUID="92786931-9511-4563-b00f-101fa8858e09" TYPE="ext3"
/dev/hda9: LABEL="/boot" UUID="2734cdc3-39b7-48b0-82f5-a30d64d24864" TYPE="ext3"
/dev/hda8: LABEL="SWAP-hda8" TYPE="swap"
/dev/hda1: TYPE="ntfs"
/dev/hda5: LABEL="BAK" UUID="3C45-DCD2" TYPE="vfat"
/dev/hda6: UUID="3f29caa8-a6d9-409c-a2b7-94e20ce847d2" TYPE="ext3"
/dev/hda7: UUID="30e851a4-0c0d-4291-8403-14535d38e131" TYPE="ext3"
[root@rhelas53 /]#