Acutally, if you installed over the base Ubuntu, you technically aren't actually running Lubuntu, which is a whole separated Ubuntu distro based on LXDX, what you are running is LXDE overlaid on top of the standard Unity version of Ubuntu.
I mention this, not to be overly technical, but just so if you ever need more help, you know exactly what you have
LXDE does work very nicely - you don't get quite the level of desktop integration and goodies as you have available in Gnome Classic (which is why it's nice to have access to both) but LXDE is catching up fast on features, and it's definitely quite a bit faster.
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