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Eliah Kagan's answer to how to remove KDE here (How to remove all traces of KDE installed) is a great first step in removing KDE from a Ubunutu, but I still have remnants of KDE that were not removed in Plymouth and LightDM. How do you remove these?

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Do they harm in any way? If not, why bother? –  Gunnar Hjalmarsson May 21 at 15:05
    
Hi Gunnar, I tried to add this as an addition to the suggested answer, but it was rejected, so I wanted to add it here so that others were looking for how to remove these would have an easy place to find it. As for harm, that's not the point, it's about restoring the behavior of the OS to the pre-installation state. –  syserss May 21 at 15:11

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The steps in the previous question will remove all of the KDE software, but it won't restore your system back to pre-KDE install state. There are two additional steps that I had to do to restore my system to pre-installation of kubuntu-desktop.

The first was to modify the Plymouth configuration to remove the "Kubuntu" splash screen (this is just cosmetic, but still annoying and unclean, documented here 1):

sudo update-alternatives --config default.plymouth sudo update-initramfs -u

And the second was to restore the lightdm configruation to use the unity-greeter instead of kde-plasma-greeter. First run this command to open the lightdm configuration page -

sudo gedit /etc/lightdm/lightdm.conf

and then edit it to replace these lines:

greeter-session=unity-greeter user-session=ubuntu

This last step I cobbled together from these two pages, 2 and 3.

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