I just upgraded my system from Lubuntu 18.04 to 19.10 using apt dist-upgrade from the command line. I can boot up and almost everything works just like before (display, audio, input devices, wired and wireless network), EXCEPT that all of my windows are missing their close/resize buttons, and there is no window chrome to select in order to move or resize the windows.
I have noticed that if I switch to a Plasma desktop from the LightDM login screen, I do get all of these controls, but of course it's a completely different desktop environment. The default Lubuntu environment is the one with issues.
Any ideas what could be causing this?
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