xubuntu – desktop background lock LightDM

I am having a problem when logging into Xubuntu 18.04. Everything starts up fine, but when I really start the session, the LightDM background remains on the screen and there is nothing else, there are no panels, when clicking with the right button a menu does not appear.

I know that everything is there because I can use the keyboard shortcuts to open a terminal, and although it is not yet displayed, the cursor changes to an I-beam where the terminal opens. I can make it all go back to normal & # 39; pressing Ctrl + Alt + F1 and then Ctrl + Alt + F7, even the windows that I opened with the shortcuts are there.

This happens every time I log in, even if I just log out. I'm still learning to use Linux and I'm not sure where to look. Any suggestions will be appreciated.