instalação do grub em dual boot

[iseppe]

 boa tarde instalei  12.04 e  não aparece o grub  para escolha do sistema e vai direto para o ubuntu


root@barcelos:~# sudo fdisk
Usage:
fdisk [options] <disk>    change partition table
fdisk [options] -l <disk> list partition table(s)
fdisk -s <partition>      give partition size(s) in blocks

Options:
-b <size>             sector size (512, 1024, 2048 or 4096)
-c[=<mode>]           compatible mode: 'dos' or 'nondos' (default)
-h                    print this help text
-u[=<unit>]           display units: 'cylinders' or 'sectors' (default)
-v                    print program version
-C <number>           specify the number of cylinders
-H <number>           specify the number of heads
-S <number>           specify the number of sectors per track

root@barcelos:~#
agradeço desde já!!!!!!

[King11]

Terminal:

sudo fdisk -l

[iseppe]

coloquei o comando mais o grub não aparece..........!!!!!!!!!!!
Disco /dev/sda: 500.1 GB, 500107862016 bytes
255 cabeças, 63 setores/trilhas, 60801 cilindros, total de 976773168 setores
Unidades = setores de 1 * 512 = 512 bytes
Tamanho do setor (lógico/físico): 512 bytes / 512 bytes
Tamanho da E/S (mínimo/ideal): 512 bytes / 512 bytes
Identificador do disco: 0xa686db42

Dispositivo Boot Início Fim Blocos Id Sistema
/dev/sda2       456630272   879855615   211612672    7  HPFS/NTFS/exFAT
/dev/sda3       879855616   883769677     1957031   82  Linux swap / Solaris
/dev/sda4       883771390   976771071    46499841    5  Estendida
/dev/sda5       883771392   976771071    46499840   83  Linux
root@barcelos:~#

[King11]

Atualiza o Grub e reinicia!

sudo update-grub

[pylm69]

posta o teu /boot/grub/grub.cfg ai, pode ser só setar um tempo pra ele, não tem que fazer mil malabarismos 

[iseppe]

#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/00_header ###
if [ -s $prefix/grubenv ]; then
  set have_grubenv=true
  load_env
fi
set default="0"
if [ "${prev_saved_entry}" ]; then
  set saved_entry="${prev_saved_entry}"
  save_env saved_entry
  set prev_saved_entry=
  save_env prev_saved_entry
  set boot_once=true
fi

function savedefault {
  if [ -z "${boot_once}" ]; then
    saved_entry="${chosen}"
    save_env saved_entry
  fi
}

function recordfail {
  set recordfail=1
  if [ -n "${have_grubenv}" ]; then if [ -z "${boot_once}" ]; then save_env recordfail; fi; fi
}

function load_video {
  insmod vbe
  insmod vga
  insmod video_bochs
  insmod video_cirrus
}

insmod part_msdos
insmod ext2
set root='(hd0,msdos5)'
search --no-floppy --fs-uuid --set=root f3e156ac-8ca7-4a8c-8bd6-d88ca028b784
if loadfont /usr/share/grub/unicode.pf2 ; then
  set gfxmode=auto
  load_video
  insmod gfxterm
  insmod part_msdos
  insmod ext2
  set root='(hd0,msdos5)'
  search --no-floppy --fs-uuid --set=root f3e156ac-8ca7-4a8c-8bd6-d88ca028b784
  set locale_dir=($root)/boot/grub/locale
  set lang=pt_BR
  insmod gettext
fi
terminal_output gfxterm
if [ "${recordfail}" = 1 ]; then
  set timeout=-1
else
  set timeout=10
fi
### END /etc/grub.d/00_header ###

### BEGIN /etc/grub.d/05_debian_theme ###
set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
if background_color 44,0,30; then
  clear
fi
### END /etc/grub.d/05_debian_theme ###

### BEGIN /etc/grub.d/10_linux ###
function gfxmode {
   set gfxpayload="${1}"
   if [ "${1}" = "keep" ]; then
      set vt_handoff=vt.handoff=7
   else
      set vt_handoff=
   fi
}
if [ "${recordfail}" != 1 ]; then
  if [ -e ${prefix}/gfxblacklist.txt ]; then
    if hwmatch ${prefix}/gfxblacklist.txt 3; then
      if [ ${match} = 0 ]; then
        set linux_gfx_mode=keep
      else
        set linux_gfx_mode=text
      fi
    else
      set linux_gfx_mode=text
    fi
  else
    set linux_gfx_mode=keep
  fi
else
  set linux_gfx_mode=text
fi
export linux_gfx_mode
if [ "${linux_gfx_mode}" != "text" ]; then load_video; fi
menuentry 'Ubuntu, com Linux 3.8.0-33-generic' --class ubuntu --class gnu-linux --class gnu --class os {
   recordfail
   gfxmode $linux_gfx_mode
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='(hd0,msdos5)'
   search --no-floppy --fs-uuid --set=root f3e156ac-8ca7-4a8c-8bd6-d88ca028b784
   linux   /boot/vmlinuz-3.8.0-33-generic root=UUID=f3e156ac-8ca7-4a8c-8bd6-d88ca028b784 ro   quiet splash $vt_handoff
   initrd   /boot/initrd.img-3.8.0-33-generic
}
menuentry 'Ubuntu, com Linux 3.8.0-33-generic (modo de recuperação)' --class ubuntu --class gnu-linux --class gnu --class os {
   recordfail
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='(hd0,msdos5)'
   search --no-floppy --fs-uuid --set=root f3e156ac-8ca7-4a8c-8bd6-d88ca028b784
   echo   'Carregando Linux 3.8.0-33-generic ...'
   linux   /boot/vmlinuz-3.8.0-33-generic root=UUID=f3e156ac-8ca7-4a8c-8bd6-d88ca028b784 ro recovery nomodeset
   echo   'Carregando ramdisk inicial ...'
   initrd   /boot/initrd.img-3.8.0-33-generic
}
submenu "Previous Linux versions" {
menuentry 'Ubuntu, com Linux 3.8.0-29-generic' --class ubuntu --class gnu-linux --class gnu --class os {
   recordfail
   gfxmode $linux_gfx_mode
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='(hd0,msdos5)'
   search --no-floppy --fs-uuid --set=root f3e156ac-8ca7-4a8c-8bd6-d88ca028b784
   linux   /boot/vmlinuz-3.8.0-29-generic root=UUID=f3e156ac-8ca7-4a8c-8bd6-d88ca028b784 ro   quiet splash $vt_handoff
   initrd   /boot/initrd.img-3.8.0-29-generic
}
menuentry 'Ubuntu, com Linux 3.8.0-29-generic (modo de recuperação)' --class ubuntu --class gnu-linux --class gnu --class os {
   recordfail
   insmod gzio
   insmod part_msdos
   insmod ext2
   set root='(hd0,msdos5)'
   search --no-floppy --fs-uuid --set=root f3e156ac-8ca7-4a8c-8bd6-d88ca028b784
   echo   'Carregando Linux 3.8.0-29-generic ...'
   linux   /boot/vmlinuz-3.8.0-29-generic root=UUID=f3e156ac-8ca7-4a8c-8bd6-d88ca028b784 ro recovery nomodeset
   echo   'Carregando ramdisk inicial ...'
   initrd   /boot/initrd.img-3.8.0-29-generic
}
}
### END /etc/grub.d/10_linux ###

### BEGIN /etc/grub.d/20_linux_xen ###
### END /etc/grub.d/20_linux_xen ###

### BEGIN /etc/grub.d/20_memtest86+ ###
menuentry "Memory test (memtest86+)" {
   insmod part_msdos
   insmod ext2
   set root='(hd0,msdos5)'
   search --no-floppy --fs-uuid --set=root f3e156ac-8ca7-4a8c-8bd6-d88ca028b784
   linux16   /boot/memtest86+.bin
}
menuentry "Memory test (memtest86+, serial console 115200)" {
   insmod part_msdos
   insmod ext2
   set root='(hd0,msdos5)'
   search --no-floppy --fs-uuid --set=root f3e156ac-8ca7-4a8c-8bd6-d88ca028b784
   linux16   /boot/memtest86+.bin console=ttyS0,115200n8
}
### END /etc/grub.d/20_memtest86+ ###

### BEGIN /etc/grub.d/30_os-prober ###
if [ "x${timeout}" != "x-1" ]; then
  if keystatus; then
    if keystatus --shift; then
      set timeout=-1
    else
      set timeout=0
    fi
  else
    if sleep --interruptible 3 ; then
      set timeout=0
    fi
  fi
fi
### END /etc/grub.d/30_os-prober ###

### BEGIN /etc/grub.d/30_uefi-firmware ###
### END /etc/grub.d/30_uefi-firmware ###

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f  $prefix/custom.cfg ]; then
  source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
ate o  momento  não está funcionando

[selvaking]

Use o comando abaixo no terminal

Código Selecionar Expandir

sudo sed -e s"|^GRUB_HIDDEN_TIMEOUT=0|#GRUB_HIDDEN_TIMEOUT=0|"g /etc/default/grub && sudo update-grub