/usr/share/debhelper/autoscripts/prerm-dkms is in dkms 2.2.0.3-2ubuntu11.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | DKMS_NAME=#MODULE_NAME#
DKMS_VERSION=#MODULE_VERSION#
case "$1" in
remove|upgrade|deconfigure)
if [ "$(dkms status -m $DKMS_NAME -v $DKMS_VERSION)" ]; then
dkms remove -m $DKMS_NAME -v $DKMS_VERSION --all
fi
;;
esac
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