How To Reset Your Kubuntu Password When You Have Forgotten It

im so scared because i have not logged into my server for about two years now and i forgot my root password for my linux dedicated server so i was wondering how i can reset my password or even change it remotely without having to pay for support or for someone else to change my password. i can't believe i forgot it. well, actually, i lost it, i have written it down so i can remember for times like this but it forgot where i put it.