grub error 15.. e non parte più..

[mcastel]

Salve,

credo di aver combinato un pasticcio sul mio vecchio laptop: volendo istallare Xubuntu e non avendo il cdrom funzionante, ho usato UNebootin per lanciare la iso di xubuntu 8.10, dopodichè ho specificato le partizioni per istallarla (il sistema contiene anche windows xp); la cosa sembra sia andata tutta liscia fino a che il sistema non ha fatto il reboot: a questo punto mi sono trovato davanti ad un laconico "error 15" di grub, senza possibilità di andare avanti o ottenere una shell...

Forse il problema è che unebootin è montato in loopback e dunque grub si è istallato in maniera "strana" ??

Come mi consigliate di intervenire (tenete conto che non ho il cdrom)? Posso usare una chiavetta usb?

Grazie in anticipo per ogni chiarimento :-)

[patel]

15 : File not found
    This error is returned if the specified file name cannot be found, but everything else (like the disk/partition info) is OK.
posta cat /boot/grub/menu.lst e sudo fdisk -l

[mcastel]

15 : File not found
    This error is returned if the specified file name cannot be found, but everything else (like the disk/partition info) is OK.
posta cat /boot/grub/menu.lst e sudo fdisk -l

Veramente il problema è che non riesco ad ottenere un prompt di shell per dare qualsiasi comando.. se premo "c" o praticamente ogni altro tasto, non ottengo proprio nulla....

[Mozo]

Posso usare una chiavetta usb?

Se il tuo laptop supporta il boot da usb, penso sia la cosa migliore.
Crea una usblive su di un altro pc come spiegato qui http://wiki.ubuntu-it.org/DanielSchwitzgebel/Prove3
In questo modo da live potrai verificare il tuo menu.lst, oppure ritentare l'installazione.

[mcastel]

Non avevo chiaro che Ubuntu permettesse così facilmente di istallarsi su una USB.

Grazie per il consiglio, credo che procederò in questo modo! ;-)

[akplm]

ciao.
mi collego a questa discussione:
ho avuto un problema simile. ho provato a disinstallare i vecchi kernel lasciando solo il piu nuovo.
ora quando avvio il grub mi da da selezionare i kernel che evidentemente avevo disinstallato!
che fare?
se reinstallo il grub? reinstallando ubuntu in un altra partizione?
in effetti ho una altra mini partizione funzionante....posso risolvere da qua?

[Mozo]

Direi che mantenere i vecchi kernel sia come avere sempre a disposizione un'auto di scorta (la ruota di scorta è il recovery mode).   

Comunque potresti avviare da livecd e con essa recuperare i dati del nuovo kernel (l'unico che hai ancora, da quello che si capisce) da inserire nella source list.

esegui nel terminale per guardare nella cartella boot e vedere il nome del kernel è installato (tipo 2.6.27-9-generic).

Codice: Seleziona tutto

ls /media/disk/boot/

A questo punto apri il "menu.lst" con

Codice: Seleziona tutto

sudo gedit /media/disk/boot/grub/menu.lst

e modifica il nome del kernel presente con quello che hai trovato col comando precedente.

Al riavvio dovresti avere il kernel giusto.

Se hai dubbi posta il risultato dei due comandi qui inserendoli col tag codice #

[akplm]

ciao
ti posto il risultato

akplm@ubu:~$ ls /media/disk/boot/
abi-2.6.24-22-generic             initrd.img-2.6.24-22-rt.bak
config-2.6.24-22-generic          memtest86+.bin
config-2.6.24-22-rt               System.map-2.6.24-22-generic
grub                              System.map-2.6.24-22-rt
initrd.img-2.6.24-22-generic      vmlinuz-2.6.24-22-generic
initrd.img-2.6.24-22-generic.bak  vmlinuz-2.6.24-22-rt
initrd.img-2.6.24-22-rt

ho la vaga impressone che non ci sono kernel....

inoltre io ho due partizioni! credo che il file di grub sia nella prima.....cioè in quella a cui riesco ad accedere....quindi suppongo che dovrei modificare quel file,,,

[Mozo]

Come non ci sono kernel...  Ne hai due: il generic e l'rt.

posta il risultato del secondo comando segnato prima e ti dico come modificarlo.

[akplm]

ecco il menu.lst

Codice: Seleziona tutto

# 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

#A splash image for the menu
splashimage=(hd0,6)/boot/grub/splashimages/Mac4Lin_1.0_GRUB1.xpm.gz

## 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=34248467-b2a5-4b28-9cce-01f84a33337b ro

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

## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd0,6)

## 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 2.6.24-22-rt
root		(hd0,6)
kernel		/boot/vmlinuz-2.6.24-22-rt root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro quiet splash
initrd		/boot/initrd.img-2.6.24-22-rt
quiet

title		Ubuntu 8.04.1, kernel 2.6.24-22-rt (recovery mode)
root		(hd0,6)
kernel		/boot/vmlinuz-2.6.24-22-rt root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro single
initrd		/boot/initrd.img-2.6.24-22-rt

title		Ubuntu 8.04.1, kernel 2.6.24-22-generic
root		(hd0,6)
kernel		/boot/vmlinuz-2.6.24-22-generic root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro quiet splash
initrd		/boot/initrd.img-2.6.24-22-generic
quiet

title		Ubuntu 8.04.1, kernel 2.6.24-22-generic (recovery mode)
root		(hd0,6)
kernel		/boot/vmlinuz-2.6.24-22-generic root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro single
initrd		/boot/initrd.img-2.6.24-22-generic

title		Ubuntu 8.04.1, memtest86+
root		(hd0,6)
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		Ubuntu 8.04, kernel 2.6.24-16-386 (on /dev/sda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-16-386 root=UUID=e794f07f-a3e4-4a2f-b0f8-7dda42ad39f4 ro quiet splash 
initrd		/boot/initrd.img-2.6.24-16-386
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda1.
title		Ubuntu 8.04, kernel 2.6.24-16-386 (recovery mode) (on /dev/sda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-16-386 root=UUID=e794f07f-a3e4-4a2f-b0f8-7dda42ad39f4 ro single 
initrd		/boot/initrd.img-2.6.24-16-386
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda1.
title		Ubuntu 8.04, kernel 2.6.24-16-generic (on /dev/sda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-16-generic root=UUID=e794f07f-a3e4-4a2f-b0f8-7dda42ad39f4 ro quiet splash 
initrd		/boot/initrd.img-2.6.24-16-generic
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda1.
title		Ubuntu 8.04, kernel 2.6.24-16-generic (recovery mode) (on /dev/sda1)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-16-generic root=UUID=e794f07f-a3e4-4a2f-b0f8-7dda42ad39f4 ro single 
initrd		/boot/initrd.img-2.6.24-16-generic
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda1.
title		Ubuntu 8.04, memtest86+ (on /dev/sda1)
root		(hd0,0)
kernel		/boot/memtest86+.bin  
savedefault
boot

ovviamente c'e' un altro menu.lst: quello della partizione funzionate....che è im realtà quello che vedo all'avvio del boot:

[

Codice: Seleziona tutto

quote]# 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=55a4b168-6a9c-48f4-876e-3c5d57d17f76 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, kernel 2.6.24-22-rt
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-22-rt root=UUID=55a4b168-6a9c-48f4-876e-3c5d57d17f76 ro quiet splash
initrd		/boot/initrd.img-2.6.24-22-rt
quiet

title		Ubuntu 8.04, kernel 2.6.24-22-rt (recovery mode)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-22-rt root=UUID=55a4b168-6a9c-48f4-876e-3c5d57d17f76 ro single
initrd		/boot/initrd.img-2.6.24-22-rt

title		Ubuntu 8.04, 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/sda6.
title		Ubuntu 8.04, kernel 2.6.24-19-rt (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-19-rt root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro quiet splash 
initrd		/boot/initrd.img-2.6.24-19-rt
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, kernel 2.6.24-19-rt (recovery mode) (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-19-rt root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro single 
initrd		/boot/initrd.img-2.6.24-19-rt
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, kernel 2.6.24-16-rt (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-16-rt root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro quiet splash 
initrd		/boot/initrd.img-2.6.24-16-rt
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, kernel 2.6.24-16-rt (recovery mode) (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-16-rt root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro single 
initrd		/boot/initrd.img-2.6.24-16-rt
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, kernel 2.6.24-16-generic (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-16-generic root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro quiet splash 
initrd		/boot/initrd.img-2.6.24-16-generic
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, kernel 2.6.24-16-generic (recovery mode) (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-16-generic root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro single 
initrd		/boot/initrd.img-2.6.24-16-generic
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, memtest86+ (on /dev/sda6)
root		(hd0,5)
kernel		/boot/memtest86+.bin  
savedefault
boot
[/quote]

[Mozo]

Innazitutto hai notato la differenza, nell'inserimento di testo, tra codice e citazione?

Quindi hai due ubuntu installati, di cui uno funzionante (per cui il livecd era inutile), forse era il caso di spiegarlo prima...

Qual'è che non riesci ad avviare?

Quello in sda1 oppure in sda6?

[akplm]

si...hai ragione....ho sbagliato....la citazione correggo!
cmq si ho due ubuntu installati!
non riesco ad avviare in sda6

[Mozo]

Codice: Seleziona tutto

# 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=55a4b168-6a9c-48f4-876e-3c5d57d17f76 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, kernel 2.6.24-22-rt
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-22-rt root=UUID=55a4b168-6a9c-48f4-876e-3c5d57d17f76 ro quiet splash
initrd		/boot/initrd.img-2.6.24-22-rt
quiet

title		Ubuntu 8.04, kernel 2.6.24-22-rt (recovery mode)
root		(hd0,0)
kernel		/boot/vmlinuz-2.6.24-22-rt root=UUID=55a4b168-6a9c-48f4-876e-3c5d57d17f76 ro single
initrd		/boot/initrd.img-2.6.24-22-rt

title		Ubuntu 8.04, 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/sda6.
title		Ubuntu 8.04, kernel 2.6.24-22-rt (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-22-rt root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro quiet splash 
initrd		/boot/initrd.img-2.6.24-22-rt
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, kernel 2.6.24-22-rt (recovery mode) (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-22-rt root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro single 
initrd		/boot/initrd.img-2.6.24-22-rt
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, kernel 2.6.24-22-generic (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-22-generic root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro quiet splash 
initrd		/boot/initrd.img-2.6.24-22-generic
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, kernel 2.6.24-22-generic (recovery mode) (on /dev/sda6)
root		(hd0,5)
kernel		/boot/vmlinuz-2.6.24-22-generic root=UUID=34248467-b2a5-4b28-9cce-01f84a33337b ro single 
initrd		/boot/initrd.img-2.6.24-22-generic
savedefault
boot


# This entry automatically added by the Debian installer for an existing
# linux installation on /dev/sda6.
title		Ubuntu 8.04, memtest86+ (on /dev/sda6)
root		(hd0,5)
kernel		/boot/memtest86+.bin  
savedefault
[b]boot[/b]

Ecco quello corretto da sostituire, ho solo cambiato il numero 19 con 22 e ripulito dai kernel che non ci sono più.
Volendo puoi sostituire solo ciò che c'è scritto dopo la riga
### END DEBIAN AUTOMAGIC KERNELS LIST
in pratica solo quello che ho modificato