I had a fresh installation of Lubuntu 18.04 (no upgrade) and upgraded to 18.10 today. Afterwards I was booted into a graphical user interface that does not look like Lubuntu. My settings for the panel are gone.
When logging in I have four options for desktop environments:
When I chose Lubuntu I have this new look. Chosing LXQt looks the same, but is not exactly the same (e.g. different panel content). Openbox leads to a black screen where I can use the right mouse to open a context menu that looks a bit like a start menu.
How can I get Lubuntu desktop back?