GRUB2 doesn't read "boot" directory with different configuration file (in /boot/grub)

[HomoHuman]

Excuse me, my English is not good enough.
I get "file not found" message and when use the ls command:
grub rescue> ls /boot

nothing is displayed.
Other variant of command display:
grub rescue> ls /
./ ../ /boot /folder
grub rescue> ls /folder
./ ../ readme
And command set display:
grub rescue> set
prefix=(hd0,msdos2)/boot/grub
root=(hd0,msdos2)

Linux command display:
ls -l /
drwxr-xr-x 6 root root 4096 date-time boot
drwxr-xr-x 2 root root 4096 date-time folder
ls -l /boot
drwxr-xr-x 3 root root 8192 date-time grub
other files and directories

Boot flag was activated on partition ext2.
GRUB installation passed without errors.

[HomoHuman]

Additional information.
I installed GRUB2 to the MBR with help of commands:
sudo mount /dev/sdb2 /mnt
sudo grub-install --root-directory=/mnt /dev/sdb

[Bashing-om]

HomoHuman; Hi ! Welcome to the forum.

Not knowing your system configuration, I am not able to give direct advise.

These links will provide the needed instruction to repair/install grub properly.
https://help.ubuntu.com/community/Grub2
http://howtoubuntu.org/how-to-repair...buntu-live-cd/
https://help.ubuntu.com/community/Gr...nd_Rescue_Mode
https://help.ubuntu.com/community/Grub2/Troubleshooting

Post back as/if additional assistance is required.

kind regards <==BDQ

[HomoHuman]

My system configuration:
Operational system: Kubuntu 11.10;
Сentral processing unit: Intel Pentium Dual CPU T2390 1.86GHz;
Memory: 2 GB;
Video card: NVIDIA GeForce 8400M GS

My BIOS make it possible to load kubuntu-11.10-desktop-amd64 from a USB flash drive.

GRUB2 don't work on my external hard drive (sdb).

[HomoHuman]

All links exept http://howtoubuntu.org/how-to-repair...buntu-live-cd/ I has tried.
I cannot use "insmod" and other commands because GRUB2 do not find any files and directories in /boot.

[HomoHuman]

Please, answer me why I get:
chroot: failed to run command `/bin/bash': No such file or directory
when enter "sudo chroot /mnt".

[efflandt]

Some computers just have a problem booting from large external drives, but I never figured out why. For example, my Dell desktop PC from 2010 boots Linux fine at the far end of its 1 TB internal drive (near 900 GB out), boots fine from 160 GB USB drive, but cannot boot from 500 GB external drive (falls to grub rescue prompt). Even if I boot complete grub on internal drive and go to regular grub prompt (instead of rescue), it can see the root of the external drive and into boot, but not into boot/grub.

The same 500 GB USB drives boot Linux fine on older Dell and Toshiba laptops from 2006, so there is nothing wrong with grub or Ubuntu installation on those drives.

[HomoHuman]

Best thanks, efflandt.

[DusteDdk]

Some computers just have a problem booting from large external drives,

Yup, creating a 3 GiB partition in the beginning solved this for me as well

[HomoHuman]

I installed Linux on external hard disk from live CD/live USB successfully with insignificant errors.
My cfg-files (hand-made and automatically made) look differently.