My system is Ubuntu 18.04 with Kubuntu desktop running on a Raspberry Pi Model 4, 8 GB.
Until recently all was working fine when I logged in from Windows 10 via Remote Desktop. The current issue is that after Remote Desktop accepts my login credentials, Kubuntu desktop begins to load but hangs after I enter the login credentials at its prompt. The desktop background shows, and the mouse pointer moves; however, there is no response to key or mouse clicks from the system at that point.
I am still able to login to the user account via wifi SSH to the command line.
A strange thing happens to an already open, separate command line SSH terminal after a failed login attempt to Kubuntu desktop via Remote Desktop. The SSH terminal has stopped running BASH properly. A "ls -l" produces no response other than a blank new line and no ubuntu prompt. A CTRL-C is needed to get back to the normal prompt. Switching to sh then correctly runs "ls-l".
Attempts to login in with monitor, keyboard and mouse attached directly to the RPi result in the same issue as with Remote Desktop - system hangs with desktop showing.
I have created another user as a test and can login to that user via Remote Desktop without problems. So, my novice-level conclusion is that I have done something to foul up my original user account.
I really need to get back to being able to use the original user account and appreciate any suggestions as to how to repair things.
Thanks in advance!