Problem with lxqt?

Question

linux

Hello. Ubuntu 18.04.4 LTS system.
Installed LXQT Desktop.
And the first time you log in, you need to select a window manager from the list. In theory, everything should be like on the first screen.
And I have it like in the second photo: There are no window managers in the list at all, although I installed them separately before that.
Who knows how to solve?
Screen 1:
Photo:

Answer 1

So now the graphics are running OK? in the terminal we write startx - Xs are loaded?

Answer 2

- go to the console Ctrl + Alt + F2
- log in
- put openbox
apt install openbox
- go back to the graphics, click on "Other" in the list and select /usr/bin/openbox
You can immediately try to select /usr/bin/openbox it is already must be installed