I don't think it's going to remove the actual desktop environment. lubuntu-desktop is only a meta package that when installed will pull in all the packages that is needed for the desktop to work. But if you remove the meta-package I don't think it'll remove the individual desktop packages. I could be wrong though and either way it is indeed confusing.
This is a problem with Ubuntu and the APT package manager system though, not Linux itself. Arch Linux for example also have meta-packages, or so called group packages, that you can install. But they're not treated like actual packages that other packages depend on like in Ubuntu.
Edit: If it does remove the whole desktop, which would be madness indeed, running the command 'sudo apt-get install lubuntu-desktop' in a terminal/tty will install it again.
This is a problem with Ubuntu and the APT package manager system though, not Linux itself. Arch Linux for example also have meta-packages, or so called group packages, that you can install. But they're not treated like actual packages that other packages depend on like in Ubuntu.
Edit: If it does remove the whole desktop, which would be madness indeed, running the command 'sudo apt-get install lubuntu-desktop' in a terminal/tty will install it again.