You can also get different varieties of Ubuntu with different default desktop environments, named as portmanteaus of [DE name] + “Ubuntu.” Specifically, there’s Kubuntu (with KDE), Xubuntu (with XFCE), and most relevantly, Lubuntu (with LXQT).
Note that LXQT isn’t the same thing as LXDE, but is sort of a successor to it (even though LXDE is also still maintained).
sudo apt install lxde
(or sudo apt install lxqt
, for that matter) is definitely simpler than starting over installing a Lubuntu image though, so try that first.
LOL, no they won’t. They’ll just make you throw out your nail clippers and water, while routinely missing shit that’s actually dangerous.