If you had enough playing with LXQt desktop on xubuntu, and now you want to get rid of it, removing LXQt desktop is as easy as installing it.
To uninstall LXQt desktop on xubuntu (or any other ubuntu variantions), simply run apt-get purge followed by the name of the package, in this case is 'lxqt'.
sudo apt-get purge lxqt
and then run apt-get autoremove to remove the dependencies packages
sudo apt-get autoremove
That's it, lxqt desktop should be gone by now, and you might want to restart your computer, just to make sure.
sudo reboot
