Create the /mnt/lfs directory by running:
mkdir -p /mnt/lfs |
Now mount the LFS partition by running:
mount /dev/xxx /mnt/lfs |
Replace "xxx" by the partition's designation (like hda11).
If you decided to create multiple partitions for LFS (say $LFS and $LFS/usr), mount them like this:
mkdir -p /mnt/lfs && mount /dev/xxx /mnt/lfs && mkdir /mnt/lfs/usr && mount /dev/yyy /mnt/lfs/usr |
Of course, replace /dev/xxx and /dev/yyy with the appropriate partition designations.