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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?

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    @Aravind, seems that it'll work. Let me try... Oh, it's more than a desktop environment! It says that it needs to get 906 MB of archives. I don't think a desktop environment is that much big, 'cause even kubuntu-desktop was 331 MB only. Anyways, thanks for help! – v_ag Jan 24 '18 at 7:43
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    What do you see with sudo apt install plasma-desktop? – DK Bose Jan 24 '18 at 11:17
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    @DKBose I'll try that... – v_ag Jan 24 '18 at 11:55
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    @DKBose I tried that and it needs to get 221 MB of archives. I hadn't installed it yet 'cause I'm not sure that it won't modify my bootup configuration. Are you sure that won't? – v_ag Jan 24 '18 at 16:29
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    Actually, I'm not in favor of having more than one desktop on the same system. So I haven't tried installing plasma-desktop on Ubuntu. Instead, I did a clean install of Kubuntu. – DK Bose Jan 25 '18 at 0:58
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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.

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sudo apt install kde-plasma-desktop

Keep in mind this will not install any Kubuntu apps so you'll have to use your OS's own ones. Also if you're not prompted to change your login manager, do:

sudo dpkg-reconfigure sddm

Personally, I would change the login manager to sddm as to me, it looks a lot more attractive but you can change it to whatever you want.

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  • plasma-desktop is more lightweight than kde-plasma-desktop, as the latter, e.g. installs a browser. Also, one potential downside of sddm is that they have a serious grudge against letting you log in as root; whereas Debian doesn't. After installing sddm, it's good I could do su, or else I'd have been locked out of superuser access; as I hadn't added my user acct. to sudoers yet. Not that you shouldn't - just be aware. – CodeLurker Mar 28 '20 at 20:50
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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.

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