不要用root登入，這不是Ubuntu系統的設計邏輯，需要用root身份時系統都會自動問你密碼，或是在終端機下使用sudo這個指令，需要輸入的密碼就是你當初安裝系統時設定的那個密碼。直接用root登入只會增加你的困擾而已（例如：誤刪系統檔。）

/dev/sdc1 /media/cdrom0 udf,iso9660 user,noauto,exec,utf8 0 0

因為你用隨身碟安裝後，系統會將隨身碟誤認為光碟機，所以把那行註解掉應該就ok了。

偶是 (HD1,0) 才能進入,應在那裡改?改了後是否按下存檔便可以?

# menu.lst – See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.

## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify ’saved’ instead of a number. In this case, the default entry
# is the entry saved with the command ’savedefault’.
# WARNING: If you are using dmraid do not use ’savedefault’ or your
# array will desync and will not let you boot your system.
default 0

## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 10

## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
#hiddenmenu

# Pretty colours
#color cyan/blue white/blue

## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line) and entries protected by the
# command ‘lock’
# e.g. password topsecret
# password –md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret

#
# examples
#
# title Windows 95/98/NT/2000
# root (hd0,0)
# makeactive
# chainloader +1
#
# title Linux
# root (hd0,1)
# kernel /vmlinuz root=/dev/hda2 ro
#

#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST

### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below

## DO NOT UNCOMMENT THEM, Just edit them to your needs

## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=afd5fea4-6f10-4db5-82ef-bf14e0e56594 ro

## Setup crashdump menu entries
## e.g. crashdump=1
# crashdump=0

## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd0,0)

## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true

## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false

## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash

## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false

## Xen hypervisor options to use with the default Xen boot option
# xenhopt=

## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0

## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single

## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all

## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true

## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false

## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false

## ## End Default Options ##

title Ubuntu 8.04.1, kernel 2.6.24-21-eeepc
root (hd0,0)
kernel /boot/vmlinuz-2.6.24-21-eeepc root=UUID=afd5fea4-6f10-4db5-82ef-bf14e0e56594 ro quiet splash
initrd /boot/initrd.img-2.6.24-21-eeepc
quiet

title Ubuntu 8.04.1, kernel 2.6.24-21-eeepc (recovery mode)
root (hd0,0)
kernel /boot/vmlinuz-2.6.24-21-eeepc root=UUID=afd5fea4-6f10-4db5-82ef-bf14e0e56594 ro single
initrd /boot/initrd.img-2.6.24-21-eeepc

title Ubuntu 8.04.1, memtest86+
root (hd0,0)
kernel /boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST

# This is a divider, added to separate the menu items below from the Debian
# ones.
title Other operating systems:
root

# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda1.
title Normal Boot (on /dev/sda1)
root (hd2,0)
kernel /boot/vmlinuz-2.6.21.4-eeepc quiet rw vga=785 irqpoll root=/dev/sda1
initrd /boot/initramfs-eeepc.img
savedefault
boot

# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda1.
title Perform Disk Scan (on /dev/sda1)
root (hd2,0)
kernel /boot/vmlinuz-2.6.21.4-eeepc quiet rw vga=785 irqpoll root=/dev/sda1 XANDROSSCAN=y
initrd /boot/initramfs-eeepc.img
savedefault
boot

# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda1.
title Restore Factory Settings (on /dev/sda1)
root (hd2,0)
kernel /boot/vmlinuz-2.6.21.4-eeepc quiet rw vga=normal nosplash=y irqpoll root=/dev/sda1 XANDROSRESTORE=y
initrd /boot/initramfs-eeepc.img
savedefault
boot

sudo gedit /etc/fstab

然後把裡面的內容貼上來看看。