I tried Kubuntu 20.04 by installing with $ sudo tasksel install kubuntu-desktop. It worked very well but I wanted to switch back to ubuntu 20.04, so I used these to remove kubuntu:
$ sudo apt-get remove kubuntu-desktop and
$ sudo apt-get autoremove
After I reboot the desktop switched back but on the boot it didn`t. Somebody can help me about that?
If you're talking about the boot splash screen...
In terminal...
sudo update-alternatives --config default.plymouth # change to ubuntu splash
sudo update-alternatives --config text.plymouth # change to ubuntu text
sudo update-initramfs -u # update ramdisk
reboot
sudo apt purge kubuntu-desktop will purge the system of the app and any system configuration files.
Then, remove and user-specific configuration files for Kubuntu manually. Package management doesn't do this because it didn't create those files (they are created by the programs) and it doesn't know whether they are still in use, for example by a version of the program you have installed without the package manager or because your are using a shared home in a network or multi boot environment.
