fix linux mint

wireguard-dkms.postinst

#!/bin/sh
set -e

#DEBHELPER#

# Message of running rmmod & modprobe need to run after the module has been build. 

case "$1" in
        install)
                ;;

        configure)
                # Check if the wireguard module is loaded else the install will fail.
                if [ ! -f "/sys/module/wireguard/version" ]; then
                        exit 0
                fi
                if [ ! -f "/lib/modules/$(uname -r)/updates/dkms/wireguard.ko" ]; then
                        exit 0
                fi


                new="$(modinfo -F version "/lib/modules/$(uname -r)/updates/dkms/wireguard.ko" 2>/dev/null)" # Get the version of the current builded module
                old=`cat /sys/module/wireguard/version` # Get the version of the current loaded module
                if ! [ "$old" = "$new" ]; then
                        echo "You appear to have just upgraded WireGuard from version v$old to v$new."
                        echo "However, the old version is still running on your system. In order to use the"
                        echo "new version, you will need to remove the old module and load the new one."
                        echo "You can accomplish this with the following commands:"
                        echo
                        echo "    # sudo rmmod wireguard"
                        echo "    # sudo modprobe wireguard"
                        echo
                        echo "Do note that doing this will remove current WireGuard interfaces, so you may want"
                        echo "to gracefully remove them yourself prior."
                fi
                ;;
        abort-upgrade)
                ;;
        *)
                exit 0
                ;;
esac


exit 0