Can’t remove Kubuntu from my computer

For some reason, I am not able to completely remove Kubuntu and all of its associated files from my computer. I have tried many commands, including sudo apt-get purge kubuntu-desktop and the output is this:

Reading package lists... Done Building dependency tree        Reading state information... Done Package 'kubuntu-desktop' is not installed, so not removed 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded. 

Yet on start-up, the screen reads Kubuntu. What a persistent package smh. How am I suppose to get Kubuntu completely off of machine?