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I use Ubuntu 16.04.5. I had decided to try Plasma 5 desktop and did this:

 sudo add-apt-repository ppa:kubuntu-ppa/backports
 sudo apt update
 sudo apt install kubuntu-desktop

I've kept lightdm during installation. After the process finished I faced several problems with Plasma 5: It loaded dramatically slow and showed several windows with error messages. Moreover it ate 70% of my RAM which is ~2.5 Gb.

I had switched to Unity in login manager and deleted Plasma:

 sudo add-apt-repository -r ppa:kubuntu-ppa/backports
 sudo apt purge kubuntu-desktop
 sudo apt autoremove

But it looks some parts of kde are still in my system: I see KDE default cursor in login manager and in some Qt applications and when I turn on my computer I see Kubuntu logo instead of Ubuntu. I can live with startup logo but appearance of KDE cursor sometimes is annoying. How to fix it?

danielleontiev
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  • KDE or more precisely Qt apps you installed (not as part of kubuntu-desktop) will remain as you installed them, until you uninstall (remove/purge) them. The Kubuntu logo you see is the plymouth screen added by Kubuntu but it's only a graphic/wallpaper and not a program and can be changed - refer https://askubuntu.com/questions/2007/how-do-i-change-the-plymouth-bootscreen fyi: Using GTK+ apps/tools in a Qt environment (ie. KDE/LXQt/..) will cause multiple libs that do the same thing to be in memory (both GTK+ & Qt) which wastes memory.. – guiverc Feb 22 '19 at 21:52

2 Answers2

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For your cursor issue:
Delete the package breeze-cursor-theme and it's dependencies with this command:

sudo apt purge breeze-cursor-theme --autoremove

To change the boot logo, run this command:

sudo update-alternatives --config default.plymouth

You should see a list with available logo options. Chose the one you want.

After that you can delete the kubuntu "boot logo" package with this command:

sudo apt purge plymouth-theme-kubuntu-logo --autoremove

Just a tip: With this command, you can list KDE related packages:

dpkg -l | grep -i KDE

(But be careful with deleting them.)

Dominik K
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2

See if this may help:

How to remove all traces of KDE installed

  • This link shows how to remove the PPA:

https://launchpad.net/~kubuntu-ppa/+archive/ubuntu/backports

sudo apt-get install ppa-purge
sudo ppa-purge kubuntu-ppa/backports
Mikemecanic
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  • While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review – slava Feb 22 '19 at 23:11
  • Made the correction, the first link is from this website. Thanks for the clarification. – Mikemecanic Feb 22 '19 at 23:18