In 16.04, to change the background of the login screen, I followed the accepted answer at How do I change the login screen in Ubuntu 16.04+?, however, when I selected the new background, the theme of the background changed as in:
1) The text box for the password is now in the centre of the screen (instead of the middle-left).
2) The look of the login prompt is now changed to old-style rectangular gray background
3) The login grid has disappeared.
I undid all the changes, however even the original look and feel of the login prompt is totally gone.
Here is how it looks now:
Also, the lock screen has had no effect to these changes and remains original.
How do I get the login back to its original look and feel, like this?
I had a look at all the available answers, but all of them talk about previous versions of Ubuntu (not 16.04) and they dont work.
Any help is greatly appreciated.