file.txt

Install the "xdotool" utility as usual on Ubuntu, then go to "/lib/systemd/system-sleep"
directory and create a small shell script called "capslock" with the following content:

#!/bin/sh

case "$1" in
        post)
		/usr/bin/logger -t suspend -s 'Resetting CapsLock key'
                /usr/bin/xdotool --clearmodifiers --delay 500 --repeat 2 Caps_Lock
        ;;
esac

Make sure to make it executable and should be owner by the root user.