/sbin/update-grub is in grub 0.97-29ubuntu66.
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 12 13 14 15 16 17 18 19 20 21 | #!/bin/sh
#
# Wrapper to warn user about kernel-img.conf move
#
if grep -q ' */sbin/update-grub$' /etc/kernel-img.conf 2> /dev/null ; then
cat >&2 <<EOF
Your /etc/kernel-img.conf needs to be updated. Read grub's NEWS.Debian[1]
file and follow its instructions.
1. /usr/share/doc/grub/NEWS.Debian.gz
EOF
fi
if [ -x /usr/sbin/update-grub ]; then
exec /usr/sbin/update-grub "$@"
else
echo "Your /usr is broken, please fix it before call this wrapper!" >&2
fi
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