I'm currently using Ubuntu 17.10 and I recently installed Kubuntu Desktop to get KDE, the installation succeeded, but my PC got messed up as it installed dozens of applications, modified the boot configuration and start screen that made my PC run a bit slow. I finally uninstalled the Kubuntu Desktop and the applications that came with it. But I liked the look of KDE Plasma, isn't there any way to install just the KDE Plasma and not the full Kubuntu Desktop?
As DK Bose said, I tried executing this command:
~$ sudo apt-get install plasma-desktop
And voila, it worked! It certainly does. It neither installed full
kde-desktop, nor installed any more annoying apps nor modified my bootup configuration. I'm now using KDE without any problems, and the best part is my PC doesn't slow down.
Thanks to DK Bose and the Ask Ubuntu community who put efforts to solve my problem. I appreciate their efforts.
I suggest you not to install just
plasma-desktop as it is just desktop environment, using it without it's supporting programs may make the DE less productive, or may spoil your work. You can install full
kubuntu-desktop if you want to try out kde.