It`s a Dell Latitude E4310 with Xubuntu 18.04.4 LTS.
Before was everything all right, than I changed the HDD, with a new SSD, fresh install. this was about a half year ago, or maybe more.
Now, I want to revert to the old, original HDD, because I got a new laptop to use the SSD with, I restored the original HDD to the dell, which was ok before, but now is not.
After the system starts up I have a black screen with only the mouse cursor, and if I press alt-F2 the application finder shows up, wit the applications as well, except some like the terminal emulator. All the apps seems to work fine, I just have no desktop, no panels, no rigt-click.
If I log out, and log in again, the desktop background appears, but nothing else.
I`m attaching some photos below: