apt-get update
apt-get remove grub-gfxboot
apt-get install grub2

mount /dev/sda1 /media/disk1
grub-install --root-directory=/media/disk1 /dev/sda

upgrade-from-grub-legacy

su
grub
root (hd0,0)
setup (hd0)

su
grub-install /dev/sda

#! /bin/sh

# Install GRUB on your drive.
# Copyright (C) 1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009  Free Software Foundation, Inc.
#
# GRUB is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# GRUB is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GRUB.  If not, see <http://www.gnu.org/licenses/>.

# Initialize some variables.
transform="s,x,x,"

prefix=/usr
exec_prefix=${prefix}
sbindir=${exec_prefix}/sbin
bindir=${exec_prefix}/bin
libdir=${exec_prefix}/lib
PACKAGE_NAME=GRUB
PACKAGE_TARNAME=grub
PACKAGE_VERSION=1.97~beta4
target_cpu=i386
platform=pc
pkglibdir=${libdir}/`echo ${PACKAGE_TARNAME}/${target_cpu}-${platform} | sed ${transform}`

grub_setup=${sbindir}/`echo grub-setup | sed ${transform}`
if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
    grub_mkimage=${bindir}/`echo grub-mkimage | sed ${transform}`
else
    grub_mkimage=${bindir}/`echo grub-mkelfimage | sed ${transform}`
fi
grub_mkdevicemap=${sbindir}/`echo grub-mkdevicemap | sed ${transform}`
grub_probe=${sbindir}/`echo grub-probe | sed ${transform}`
rootdir=
grub_prefix=`echo /boot/grub | sed ${transform}`
modules=

install_device=
no_floppy=
force_lba=
recheck=no
debug=no

if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
    disk_module=biosdisk
else
    disk_module=ata
fi

# Usage: usage
# Print the usage.
usage () {
    cat <<EOF
Usage: grub-install [OPTION] install_device
Install GRUB on your drive.

  -h, --help              print this message and exit
  -v, --version           print the version information and exit
  --modules=MODULES       pre-load specified modules MODULES
  --root-directory=DIR    install GRUB images under the directory DIR
                          instead of the root directory
  --grub-setup=FILE       use FILE as grub-setup
  --grub-mkimage=FILE     use FILE as grub-mkimage
  --grub-mkdevicemap=FILE use FILE as grub-mkdevicemap
  --grub-probe=FILE       use FILE as grub-probe
  --no-floppy             do not probe any floppy drive
  --recheck               probe a device map even if it already exists
  --force                 install even if problems are detected
EOF
if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
    cat <<EOF
  --disk-module=MODULE    disk module to use
EOF
fi
    cat <<EOF

INSTALL_DEVICE can be a GRUB device name or a system device filename.

grub-install copies GRUB images into the DIR/boot directory specified by
--root-directory, and uses grub-setup to install grub into the boot
sector.

Report bugs to <bug-grub@gnu.org>.
EOF
}

# Check the arguments.
for option in "$@"; do
    case "$option" in
    -h | --help)
   usage
   exit 0 ;;
    -v | --version)
   echo "grub-install (GNU GRUB ${PACKAGE_VERSION})"
   exit 0 ;;
    --modules=*)
   modules=`echo "$option" | sed 's/--modules=//'` ;;
    --root-directory=*)
   rootdir=`echo "$option" | sed 's/--root-directory=//'` ;;
    --grub-setup=*)
   grub_setup=`echo "$option" | sed 's/--grub-setup=//'` ;;
    --grub-mkimage=*)
   grub_mkimage=`echo "$option" | sed 's/--grub-mkimage=//'` ;;
    --grub-mkdevicemap=*)
   grub_mkdevicemap=`echo "$option" | sed 's/--grub-mkdevicemap=//'` ;;
    --grub-probe=*)
   grub_probe=`echo "$option" | sed 's/--grub-probe=//'` ;;
    --no-floppy)
   no_floppy="--no-floppy" ;;
    --recheck)
   recheck=yes ;;
    --disk-module=*)
   if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
           disk_module=`echo "$option" | sed 's/--disk-module=//'`
        fi ;;
    # This is an undocumented feature...
    --debug)
   debug=yes ;;
    -f | --force)
        setup_force="--force" ;;
    -*)
   echo "Unrecognized option \`$option'" 1>&2
   usage
   exit 1
   ;;
    *)
   if test "x$install_device" != x; then
       echo "More than one install_devices?" 1>&2
       usage
       exit 1
   fi
   install_device="${option}" ;;
    esac
done

# added by debian patch
setup_force="--force"

# for make_system_path_relative_to_its_root()
. ${libdir}/grub/grub-mkconfig_lib

if test "x$install_device" = x; then
    echo "install_device not specified." 1>&2
    usage
    exit 1
fi

# If the debugging feature is enabled, print commands.
setup_verbose=
if test $debug = yes; then
    set -x
    setup_verbose="--verbose"
fi

# Initialize these directories here, since ROOTDIR was initialized.
case "$host_os" in
netbsd* | openbsd*)
    # Because /boot is used for the boot block in NetBSD and OpenBSD, use /grub
    # instead of /boot/grub.
    grub_prefix=`echo /grub | sed ${transform}`
    bootdir=${rootdir}
    ;;
*)
    # Use /boot/grub by default.
    bootdir=${rootdir}/boot
    ;;
esac

grubdir=${bootdir}/`echo grub | sed ${transform}`
device_map=${grubdir}/device.map

grub_probe="${grub_probe} --device-map=${device_map}"

# Check if GRUB is installed.
if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
    set $grub_setup dummy
    if test -f "$1"; then
        :
    else
        echo "$1: Not found." 1>&2
        exit 1
    fi
fi

set $grub_mkimage dummy
if test -f "$1"; then
    :
else
    echo "$1: Not found." 1>&2
    exit 1
fi

set $grub_mkdevicemap dummy
if test -f "$1"; then
    :
else
    echo "$1: Not found." 1>&2
    exit 1
fi

# Create the GRUB directory if it is not present.
test -d "$bootdir" || mkdir "$bootdir" || exit 1
test -d "$grubdir" || mkdir "$grubdir" || exit 1

# If --recheck is specified, remove the device map, if present.
if test $recheck = yes; then
    rm -f $device_map
fi

# Create the device map file if it is not present.
if test -f "$device_map"; then
    :
else
    # Create a safe temporary file.
    test -n "$mklog" && log_file=`$mklog`

    $grub_mkdevicemap --device-map=$device_map $no_floppy || exit 1
fi

# Make sure that there is no duplicated entry.
tmp=`sed -n '/^([fh]d[0-9]*)/s/\(^(.*)\).*/\1/p' $device_map \
    | sort | uniq -d | sed -n 1p`
if test -n "$tmp"; then
    echo "The drive $tmp is defined multiple times in the device map $device_map" 1>&2
    exit 1
fi

# Copy the GRUB images to the GRUB directory.
for file in ${grubdir}/*.mod ${grubdir}/*.lst ${grubdir}/*.img ${grubdir}/efiemu??.o; do
    if test -f $file && [ "`basename $file`" != menu.lst ]; then
   rm -f $file || exit 1
    fi
done
for file in ${pkglibdir}/*.mod ${pkglibdir}/*.lst; do
    cp -f $file ${grubdir} || exit 1
done
if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
    for file in ${pkglibdir}/*.img ${pkglibdir}/efiemu??.o; do
   if test -f $file; then
       cp -f $file ${grubdir} || exit 1
   fi
    done
fi

# Write device to a variable so we don't have to traverse /dev every time.
grub_device=`$grub_probe --target=device ${grubdir}`

# Create the core image. First, auto-detect the filesystem module.
fs_module=`$grub_probe --target=fs --device ${grub_device}`
if test "x$fs_module" = x -a "x$modules" = x; then
    echo "Auto-detection of a filesystem module failed." 1>&2
    echo "Please specify the module with the option \`--modules' explicitly." 1>&2
    exit 1
fi

# Then the partition map module.  In order to support partition-less media,
# this command is allowed to fail (--target=fs already grants us that the
# filesystem will be accessible).
partmap_module=`$grub_probe --target=partmap --device ${grub_device} 2> /dev/null`

# Device abstraction module, if any (lvm, raid).
devabstraction_module=`$grub_probe --target=abstraction --device ${grub_device}`

# The order in this list is critical.  Be careful when modifying it.
modules="$modules $disk_module"
modules="$modules $fs_module $partmap_module $devabstraction_module"

prefix_drive=
if [ "x${devabstraction_module}" = "x" ] ; then
    if echo "${install_device}" | grep -qx "(.*)" ; then
      install_drive="${install_device}"
    else
      install_drive="`$grub_probe --target=drive --device ${install_device}`"
    fi
    grub_drive="`$grub_probe --target=drive --device ${grub_device}`"

    # Strip partition number
    install_drive="`echo ${install_drive} | sed -e s/,[0-9]*[a-z]*//g`"
    grub_drive="`echo ${grub_drive} | sed -e s/,[0-9]*[a-z]*//g`"
    if [ "$disk_module" = ata ] ; then
        # generic method (used on coreboot and ata mod)
        uuid="`$grub_probe --target=fs_uuid --device ${grub_device}`"
        if [ "x${uuid}" = "x" ] ; then
          echo "UUID needed with ata mod, but the filesystem containing ${grubdir} does not support UUIDs." 1>&2
          exit 1
        fi
        prefix_drive="(UUID=${uuid})"
        modules="$modules fs_uuid"
    elif [ "x${grub_drive}" != "x${install_drive}" ] ; then
        uuid="`$grub_probe --target=fs_uuid --device ${grub_device}`"
        if [ "x${uuid}" = "x" ] ; then
          echo "You attempted a cross-disk install, but the filesystem containing ${grubdir} does not support UUIDs." 1>&2
          exit 1
        fi
        prefix_drive="(UUID=${uuid})"
        modules="$modules fs_uuid"
    fi
else
    prefix_drive=`$grub_probe --target=drive --device ${grub_device}`
fi

relative_grubdir=`make_system_path_relative_to_its_root ${grubdir}` || exit 1
if [ "x${relative_grubdir}" = "x" ] ; then
    relative_grubdir=/
fi

if [ "${target_cpu}-${platform}" = "i386-pc" ] ; then
    $grub_mkimage --output=${grubdir}/core.img --prefix=${prefix_drive}${relative_grubdir} $modules || exit 1

    # Now perform the installation.
    $grub_setup ${setup_verbose} ${setup_force} --directory=${grubdir} --device-map=${device_map} \
        ${install_device} || exit 1
else
    $grub_mkimage -d ${pkglibdir} --output=/boot/multiboot.img --prefix=${prefix_drive}${relative_grubdir} $modules || exit 1
fi

# Prompt the user to check if the device map is correct.
echo "Installation finished. No error reported."
echo "This is the contents of the device map $device_map."
echo "Check if this is correct or not. If any of the lines is incorrect,"
echo "fix it and re-run the script \`grub-install'."
echo

cat $device_map

# Bye.
exit 0

GRUB 1       GRUB 2
default=0             in file /etc/defaults/grub locate: default=0
# kopt ......           then which files to alter to achieve the same result in grub 2