Chroot not working when installing Grub

[t18]

Hello,

I've got CorePlus installed on my hard drive, partition sda3.

I've tried to install Grub but unsuccessfully. According with your instruction:

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$ sudo mount /dev/sdc1In my case is sda3 but it's already mounted and it seems I can't umount it (device busy) even from the live CD.

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$ sudo grub-install --boot-directory=/mnt/sdc1/boot /dev/sdcSo the installation got broken:

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error: failed to get the canonical path of 'rootfs'
They say it's better to chroot to /mnt before installing Grub. Output:

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chroot: can't execute '/bin/sh': no such file or directory
Same if I add '/bin/bash' and having the bash shell already installed.

I've been unable to create a working grub.cfg file manually. Adding your:

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      insmod ext2
                search --no-floppy --fs-uuid --set=root 3916536c-ab5b-45f4-92de-a6b8af8ec630
                menuentry "core" {
                linux /boot/vmlinuz quiet noswap waitusb=10:UUID="3916536c-ab5b-45f4-92de-a6b8af8ec630" tce=UUID="3916536c-ab5b-45f4-92de-a6b8af8ec630" tz=GMT-4 blacklist=bcma blacklist=ssb blacklist=b43 text
                initrd /boot/rootfs.gz /boot/modules.gz
                }with the correct UUID for the sda3 partition I get the error:

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unknown filesystem
you need to load the kernel first
What I've mistaken? Many thanks