I am new to the whole Ubuntu/linux community so I'm sorry if I am a noob, but lately I've had the desire to switch to a linux distro and so I did. I installed lubuntu with dual boot so that I could switch from windows to lubuntu and vice-versa, but now I want to install ONLY Ubuntu on my pc. Can someone help me remove those two OSes (Windows and Lubuntu) and install Ubuntu ?
You don't need to remove Windows or Lubuntu. Just allow Ubuntu to use the whole disk in the install process. This will destroy any data you may have on there so back up anything you want to keep first.