/sbin/installkernel is in debianutils 4.2.1ubuntu2.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 1995 - 1998, Ian A. Murdock <imurdock@debian.org>
# Copyright (C) 1998, 1999, Guy Maor
# Copyright (C) 2002, Matthew Wilcox
# Copyright (C) 2002, 2004, 2005, 2007, 2009 Clint Adams
# Copyright (C) 2009 Manoj Srivasta
#
# Install the kernel on a Debian Linux system.
#
# This script is called from /usr/src/linux/arch/i386/boot/install.sh.
# If you install it as /sbin/installkernel, you can do a "make install"
# from a generic kernel source tree, and the image will be installed to
# the proper place for Debian GNU/Linux.
set -e
# Parse the command line options. Of course, powerpc has to be all
# different, and passes in a fifth argument, just because it is
# "special". We ignore the fifth argument, and do not flag is as an
# error, which it would be for any arch apart from powerpc
if [ $# -eq 3 ] || [ $# -eq 4 ] || [ $# -eq 5 ] ; then
img="$2"
map="$3"
ver="$1"
if [ $# -ge 4 ] && [ -n "$4" ] ; then
dir="$4"
else
dir="/boot"
fi
else
echo "Usage: installkernel <version> <image> <System.map> <directory>"
exit 1
fi
# Create backups of older versions before installing
updatever () {
if [ -f "$dir/$1-$ver" ] ; then
mv "$dir/$1-$ver" "$dir/$1-$ver.old"
fi
cat "$2" > "$dir/$1-$ver"
# This section is for backwards compatibility only
if test -f "$dir/$1" ; then
# The presence of "$dir/$1" is unusual in modern intallations, and
# the results are mostly unused. So only recreate them if they
# already existed.
if test -L "$dir/$1" ; then
# If we were using links, continue to use links, updating if
# we need to.
if [ "$(readlink -f ${dir}/${1})" = "${dir}/${1}-${ver}" ]; then
# Yup, we need to change
ln -sf "$1-$ver.old" "$dir/$1.old"
else
mv "$dir/$1" "$dir/$1.old"
fi
ln -sf "$1-$ver" "$dir/$1"
else # No links
mv "$dir/$1" "$dir/$1.old"
cat "$2" > "$dir/$1"
fi
fi
}
if [ "$(basename $img)" = "vmlinux" ] ; then
img_dest=vmlinux
else
img_dest=vmlinuz
fi
updatever $img_dest "$img"
updatever System.map "$map"
config=$(dirname "$map")
config="${config}/.config"
if [ -f "$config" ] ; then
updatever config "$config"
fi
run-parts --verbose --exit-on-error --arg="$ver" --arg="$dir/$img_dest-$ver" \
/etc/kernel/postinst.d
exit 0
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