/usr/bin/grub-kbdcomp is in grub-common 1.99-21ubuntu3.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #!/bin/sh
transform="s,x,x,"
prefix="/usr"
exec_prefix="${prefix}"
bindir="${exec_prefix}/bin"
grub_mklayout=${bindir}/`echo grub-mklayout | sed ${transform}`
ckbcomp "$@" | $grub_mklayout -o "$1".gkb
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