/etc/kernel/kernel/postinst.d/x-grub-legacy-ec2 is in grub-legacy-ec2 0.7.7~bzr1212-0ubuntu1.
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 | #!/bin/sh
version="$1"
bootopt=""
# passing the kernel version is required
[ -z "${version}" ] && exit 0
# avoid running multiple times
if [ -n "$DEB_MAINT_PARAMS" ]; then
eval set -- "$DEB_MAINT_PARAMS"
if [ -z "$1" ] || [ "$1" != "configure" ]; then
exit 0
fi
fi
update=/usr/sbin/update-grub-legacy-ec2
[ ! -x "${update}" ] || exec "${update}"
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