Hi YellowApple,

I think the cmd is "grub2-install"

so i need to changed the command to "grub2-install /boot=/mnt /dev/sda" ? (Because my system installed in /boot"

it said "grub2-install copies GRUP imgage into /boot/grub2, and uses grub-setup to install grub into the boot sector

Usage: grub2-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
--boot-directory=DIR install GRUB images under the directory DIR/grub2
instead of the /boot/grub2 directory
--target=TARGET install GRUB for TARGET platform
[default=current]
--directory=DIR use GRUB images from DIR. Takes precedence
over target
--grub-setup=FILE use FILE as grub-setup
--grub-mkimage=FILE use FILE as grub-mkimage
--grub-mkrelpath=FILE use FILE as grub-mkrelpath
--grub-probe=FILE use FILE as grub-probe
--allow-floppy make the drive also bootable as floppy (default
for fdX devices). May break on some BIOSes.
--recheck delete device map if it already exists
--force install even if problems are detected
--force-file-id

So what cmd should i run to install the grub2 now?

Brgds/Brandon Chau

You did "sudo su" first, right? You'll have to be root either way.

Else, try grub2-install with the same parameters; the live CD might just not have it aliased. I know Anaconda uses grub2-install internally, so that should work.

Hi YellowApple,

Yes, i did.

I think the cmd is "grup2-install"

then i changed the cmd to "grub2-install /boot/grub2=/mnt /dev/sda" (Because my system installed in /boot"

it said "grub2-install copies GRUP imgage into /boot/grub2, and uses grub-setup to install grub into the boot sector

Usage: grub2-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
--boot-directory=DIR install GRUB images under the directory DIR/grub2
instead of the /boot/grub2 directory
--target=TARGET install GRUB for TARGET platform
[default=current]
--directory=DIR use GRUB images from DIR. Takes precedence
over target
--grub-setup=FILE use FILE as grub-setup
--grub-mkimage=FILE use FILE as grub-mkimage
--grub-mkrelpath=FILE use FILE as grub-mkrelpath
--grub-probe=FILE use FILE as grub-probe
--allow-floppy make the drive also bootable as floppy (default
for fdX devices). May break on some BIOSes.
--recheck delete device map if it already exists
--force install even if problems are detected
--force-file-id

So what cmd should i run to install the grub2 now?

Brgds/Brandon Chau

You can obviously boot the live-cd can you post the output of Looking back at how you wanted to install & if you did install there would be no boot partition also if you did create a separate boot partition you would use grub-install /dev/sda? the question mark would changed to a number something like sda1 sda2 sda3

Sure , please see below result , thanks.


Disk /dev/sda: 320.1 GB, 320072933376 bytes, 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x9aab9aab

Device Boot Start End Blocks Id System
/dev/sda1 * 6 43007999 21503997 7 HPFS/NTFS/exFAT
/dev/sda2 43008000 145408319 51200160 7 HPFS/NTFS/exFAT
/dev/sda3 145410048 146434047 512000 83 Linux
/dev/sda4 146434048 625142447 239354200 5 Extended
/dev/sda5 146436096 231442431 42503168 8e Linux LVM

Disk /dev/mapper/live-rw: 4294 MB, 4294967296 bytes, 8388608 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/live-osimg-min: 4294 MB, 4294967296 bytes, 8388608 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/fedora-usr: 21.0 GB, 20971520000 bytes, 40960000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/fedora-swap: 1572 MB, 1572864000 bytes, 3072000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/fedora-home: 10.5 GB, 10485760000 bytes, 20480000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/fedora-root: 10.5 GB, 10485760000 bytes, 20480000 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/sdb: 16.0 GB, 16008609792 bytes, 31266816 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

Device Boot Start End Blocks Id System
/dev/sdb1 32 31266815 15633392 7 HPFS/NTFS/exFAT


Brgds/Brandon Chau

Is sda3 supposed to be /boot?
If so you would install grub there.
can you also post output of

Is sda3 supposed to be /boot? Yes

i tried to run "grub2-install /dev/sda3"

but it said Path `/boot/grub2' is not readable by GRUB on boot. Installation is impossible. Aborting.

cat /etc/fstab

/dev/root / ext4 defaults,noatime 0 0
devpts /dev/pts devpts gid=5,mode=620 0 0
tmpfs /dev/shm tmpfs defaults 0 0
proc /proc proc defaults 0 0
sysfs /sys sysfs defaults 0 0

Thanks/Brandon Chau

I am sure that we are on right path you may have to wait for someone that is a little more experienced with this type of install.
I have never installed to an lvm, but I do know that in order to install/reinstall grub you will have to mount /, /boot & other devices, then chroot, before you can install grub?
LFS & gentoo have that type of documentation in their installation guides. I will search some more to assist you.

Have you tried

Now you've inspired me to try a dual-boot installation in Virtualbox with lvm I will post when done.

grub-install /dev/sda3 < yes , i tried , but it said "grub-install command not found"

haha , you can try it

I'm thinking should i install the F18 in a VM as like as you.

Thanks/Brandon Chau

I will tell you though I have a dual-boot wins7 & debian no lvm nor /boot partition & it works just fine.
Debian will install normally

For what you are trying there is a video here.
http://www.noobslab.com/2011/10/inst...usb-after.html

I have seen the video already,

but i 'm not really understand the purpose of cmd

sudo mount /dev/sdax /mnt/boot
sudo mount --bind /dev /mnt/dev/

Actually , system haven't the folder /mnt/boot and /mnt/dev , so i need to create it manually? Thanks.


p.s i follow the steps and tried , but when i run the cmd "grub2-install /dev/sda"
screen appearing "Path `/boot/grub2' is not readable by GRUB on boot. Installation is impossible. Aborting." again =.=

Brgds/Brandon Chau

Nope. It's choking on the "/boot=/mnt" blurb, because grub2-install doesn't understand that. I think you want "grub2-install --boot-partition=/mnt /dev/sda" and report the errors of that command, if any (I didn't realize you were overcomplicating things with LVM ).

Ok I finally installed fedora 18 in VB dual-booted with winsxp on 20Gig vhd, 10 Gigs prepartitioned with the same scheme as the 1 used by you.
To proceed with install I had to select the disk & partition type then, "Reclaim Space", where I had to delete the 2 partitions & tried to recreate them & the installer complained & didn't proceed.
Selected Reclaim again clicked done, then let installer do it automatically after it was done it had installed lvm, /boot partition & grub. Now I just have to get winsxp in grub menu