In chapter "8.4. Making the LFS System Bootable" when entering
root (hd0,3)
try to not type the whole line but instead type "root (" and press <tab>
key twice. Then GRUB will try to "autocomplete" your partition name and
being not able to, will print all the partitions it sees with some
information about them.
You should then choose the correct one.
The similar actions can be done directly at GRUB prompt. You should
press 'c' at the prompt and then try to type "root (" and continue as
described above.
But the problem seems to be in kernel not detecting your sdb device, so
do what Dave wrote.
--
Nothing but perfection
pv
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