I am getting a getting blank screen and no desktop after logging in putting in the right credentials. I force restarted my laptop once as it was stuck after sleep and from then on I am just getting that black screen after login. Terminal interface works fine. Ubuntu 18.04 Nvidia drivers
I just did an upgrade from Lubuntu 16.?? to Lubuntu 18.04. My symptoms were a blank screen and visible/movable mouse cursor. I could get to my desktop by switching to vt1 (ctrl-alt-F1) and switching back to vt7 (alt-F7). My issue was an xrandr command in .xprofile which worked on the earlier version of Lubuntu, but not on 18.04. I commented out the that line in .xprofile and all returned to normal.