I installed successfully Knoppix on harddisk with Lilo booting.

But then when I try to install Grub, there are problems:
Code:
knoppix:~$ grub-install /dev/hda
Could not find device for /boot: Not found or not a block device.
I look at the script /sbin/grub-install and it seems that it is due to 'df'. I already did a "ln -sf /proc/mounts /etc/mtab" and df's output is:
Code:
Filesystem           1K-blocks      Used Available Use% Mounted on
rootfs                 5067968   2056284   2754244  43% /
/dev/root              5067968   2056284   2754244  43% /
Still it doesn't work

Any idea?