grep -v '#' /boot/grub/menu.lst
cat /etc/fstab
ls -l /dev/disk/by-uuid
где-то у тебя ошибка и неправильно указан uuid раздела.
Вот что получилось:
default 0
timeout 10
title Ubuntu 8.10, kernel 2.6.27-11-generic
uuid 3851d91b-df42-42b0-abdb-722e4c007795
kernel /boot/vmlinuz-2.6.27-11-generic root=UUID=3851d91b-df42-42b0-abdb-722e4c007795 ro quiet splash
initrd /boot/initrd.img-2.6.27-11-generic
quiet
title Ubuntu 8.10, kernel 2.6.27-11-generic (recovery mode)
uuid 3851d91b-df42-42b0-abdb-722e4c007795
kernel /boot/vmlinuz-2.6.27-11-generic root=UUID=3851d91b-df42-42b0-abdb-722e4c007795 ro single
initrd /boot/initrd.img-2.6.27-11-generic
title Ubuntu 8.10, kernel 2.6.27-7-generic
uuid 3851d91b-df42-42b0-abdb-722e4c007795
kernel /boot/vmlinuz-2.6.27-7-generic root=UUID=3851d91b-df42-42b0-abdb-722e4c007795 ro quiet splash
initrd /boot/initrd.img-2.6.27-7-generic
quiet
title Ubuntu 8.10, kernel 2.6.27-7-generic (recovery mode)
uuid 3851d91b-df42-42b0-abdb-722e4c007795
kernel /boot/vmlinuz-2.6.27-7-generic root=UUID=3851d91b-df42-42b0-abdb-722e4c007795 ro single
initrd /boot/initrd.img-2.6.27-7-generic
title Ubuntu 8.10, memtest86+
uuid 3851d91b-df42-42b0-abdb-722e4c007795
kernel /boot/memtest86+.bin
quiet
title Other operating systems:
root
title Microsoft Windows XP Professional RU
root (hd0,0)
savedefault
makeactive
chainloader +1
# /etc/fstab: static file system information.
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
# /dev/sda7
UUID=3851d91b-df42-42b0-abdb-722e4c007795 / ext3 relatime,errors=remount-ro 0 1
# /dev/sda6
UUID=cde0e9ca-6d9c-4197-b211-cdbea51b3543 none swap sw 0 0
/dev/scd0 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0
итого 0
lrwxrwxrwx 1 root root 10 2009-02-07 21:58 3851d91b-df42-42b0-abdb-722e4c007795 -> ../../sda7
lrwxrwxrwx 1 root root 10 2009-02-07 21:58 8074524F745247D4 -> ../../sda1
lrwxrwxrwx 1 root root 10 2009-02-07 21:58 cde0e9ca-6d9c-4197-b211-cdbea51b3543 -> ../../sda6
lrwxrwxrwx 1 root root 10 2009-02-07 21:58 F4B44881B44847F6 -> ../../sda5
где копать не наю
А еси набрать exit, то все норм работает.