login issue in Ubuntu 18.04 then can only see the files from the terminal

The login interface looks blurred and I can not detect the login password box. However, I did a hard power off, then restart and blindly entered the password, so the monitor opened to the desktop as normal. I am not sure how to fix the login interface to get back to the normal mode.

another issue, the files generated from the terminal can be detected only through the terminal but do not exist when browsing the desktop. How can I fix it.
Thanks