Just reporting what appears to be a known problem with the upgrade. Fortunately I have my stuff backed up. I do not want to have to reinstall. I was working fine with 13.10 & decided to upgrade to 14.04. I should have waited to see if there might be problems. I know better and will not accept the offer so fast next time. After the upgrade completed, I could no longer bring up my desktop. The computer boots to the login prompt. I am able to enter my password for the normal user but it does not respond at all and simply shows an empty background (nothing to do further, nothing to click on).
Hopefully, this will be remedied. Please suggest me to bring back the computer to normal operations.