I don't know any graphical interface to add and edit users for lxde. But for xfce there is one, so maybe you can install xfce.
Code:
sudo apt-get install xubuntu-desktop
It is which actually belongs to gnome and will be installed with
Code:
sudo apt-get install gnome-system-tools
so it should work if you 'only' install that one. I think that, as long as you don't run gnome, it will not slow down your computer, it only occupies space on the HDD.
And finally, I have recently installed a desktop system with xfce, added lxde and added a user. That user showed up at login after using users-admin to create it.
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