i just now finished to install LFS(first time).
my host system is archlinux.
i didn't install grub as described in the sections 8.4.3-4 here: http://goo.gl/Hu7dSe.
i already have grub installed in my archlinux installation drive.
so, i went to arch linux wiki about grub to see how to add another grub menu.
i get into this article: https://wiki.archlinux.org/index.php/GRUB#Dual-booting

it says that for adding another grub menu, i need to edit the file '/etc/grub.d/40_custom', and add to it the menu entry of my LFS system, which is:

insmod ext2
set root=(hd0,5)
menuentry "GNU/Linux, Linux 3.13.3-lfs-7.5" {
linux /boot/vmlinuz-3.13.3-lfs-7.5 root=/dev/sda5 ro
}


if i run lsblk, i see that the drive of LFS is sda5, so the details in this menu entry are correct as i understand .

after adding this information to the file, i need to run the command:
grub-mkconfig -o /boot/grub/grub.cfg

to update the grub.cfg file to include my LFS system.

then i reboot my computer and get as usual to my grub menu.
the grub now have the new LFS entry!
but, if i chose this entry, i get error:

error: file `/boot/vmlinuz-3.13.3-lfs-7.5' not found


i boot into archlinux again, chroot to the LFS system, and checked if i have the file: '/boot/vmlinuz-3.13.3-lfs-7.5'

and yes, it's there!

so how can i overcome this problem?

thanks!

Hi

When you get to grub select the lfs option press "e" that will give you a command line which is editable, Just check that it is pointing to where lfs is as per what you put in grub, if not you can edit if needed. And as long as you are sure thats where LFS was installed.

did it now.
i see /dev/sda5 like it should be, so it seems to be good as far as i understand.
i have just 2 more linux partitions.
one for swap and another one for arch.
arch is in /dev/sda3

1 members found this post helpful.

is there a problem that /dev/sda4 is extended partition?

No.
Try to point out grub by UUID instead of sdX.
Replace root=/dev/sda5 with root=UUID=<partition UUID here> or real_root=UUID=<partition UUID here>

Lfs dosn't work with UUId.
No Extended partition wont affect it,

That all looks good as well.

You could create your own grub.cfg just save your old 1 1st then just create it like the book shows "with your settings"

done that.
doesn't work

but! i thought about something and maybe this causing all the problem.
when installing LFS, the guide tell you to make this directory: /mnt/lfs
the guide also make an environment variable $LFS which contains /mnt/lfs
after that you mount the device(mine is /dev/sda5) to the direcory you maid(/mnt/lfs).
the command is(for my computer):
mount -v -t ext4 /dev/sda5 $LFS

now /dev/sda5 attached to /mnt/lfs

but! what happened after reboot?
if i understand correctly, after reboot this mounting disappear.
i made a lot of reboots, or shuting down the computer, in the process of installing LFS system, but i never (ever!) mount my device (/dev/sda5) to the right directory (/mnt/lfs) before continue the installation, so a lot of work done in a directory that did not attached to my lfs device(/dev/sda5) as it should be!

i think i have to delete my sda5 and start all over again, and this time, every time i shutdown my computer, or reboot it, run this command:
mount -v -t ext4 /dev/sda5 $LFS

if i am right, a lot of the compilations i made, and almost all the configurations i made, were done in a directory(/mnt/lfs) that belongs to my archlinux device, which is /dev/sda3 and not to my LFS device(/dev/sda5).

am i right in all of this?

i don't remember, but i think the LFS team(again, if i'm right in what i wrote before) didn't write anything about mounting the device every time after a fresh startup of the computer.
i think that they should write it now in the guide :-)

Hi

Um yes there is a note at the bottom of Chapter 6.4

Oops, I forgot LFS doesn't use initramfs...
I would not rush to start it from the beginning.
You can enter Grub shell and try to find where is your kernel located.
When Grub menu appeared (assuming it Grub2), press "c" key and you will be put into grub shell with "grub >" prompt.
Type "ls". It will show disks and partitions list.
Run this command for all partitions:
"ls (hd0,X)/boot"
it will list all the files in boot directory for each of hd0,X partitions.
Have your lfs kernel listed on "ls (hd0,5)/boot" command or no?
Or will be it found somewhere else (on other partition)?

try mounting sda5 and have a look in the boot dir is another option also see if there ae dirs on the partition

i know, but there isn't in chapters 4 and 5.
in 5 there are a lot of compiling :-).

ok, mount sda5 cd into it see if there is anything there.

FYI I make an entry in fstab that mounts the lfs partition while I,m building

well, there is not a boot dir there(in /dev/sda5) :-)
i made a directory /mnt/pashosh
then i mount /dev/sda5 /mnt/pashosh
then i go into /mnt/pashosh and there are there just those folders:

lost+found sources tools

all my work is in /mnt/lfs directory, but /mnt/lfs isn't mounted(for a long time) to /dev/sda5.

O sorry

And you think you reboot during chapter5

yes i think this is a good thing after what i have found out now :-)

---------- Post added 11-30-14 at 11:26 PM ----------

of course i did :-).