Questions[username](ubuntu)

I am using Ubuntu 20.04.1. Recently (I haven't noticed exactly when), the graphic login screen of Ubuntu started showing the login names (the first field in the /etc/passwd file) instead of the full user names as set in the 5th (comment) field in the /etc/passwd file.

A copy of my Ubuntu user definition from /etc/passwd is given below:

fedon:x:1000:1000:Fedon Kadifeli:/home/fedon:/bin/bash

For this user, I am expecting the full name Fedon Kadifeli to be displayed on the graphical login user selection screen at the right of the account picture. However, the login name fedon is displayed instead. However, after I select the user and switch to the graphical password entry screen, the full user name of the selected login name is displayed (as expected).

How can I set Ubuntu to display the full names in the login screen again?

Notes:

1. I have a test (virtual) system with exactly the same Ubuntu version and it displays the user names correctly in the login screen. I need to find the difference between these the two systems. The user entries in /etc/passwd are exactly the same on both systems. I have checked Settings -> Users on both systems and the user definitions are also the same.

2. I tried to change the entries in /org/gnome/login-screen/ with dconf-editor. However, they have no effect. I guess the changes are made for the current user, whereas a system-wide configuration should be needed for the login screen!

3. I have also looked at: https://help.gnome.org/admin/system-admin-guide/stable/login.html.en , but I found nothing useful.

May be important:

1. There is an "accessibility" icon (the little guy with open arms) on the log in screen. I have not enabled any accessibility option; all options are in their defaults which is off. However, when I enable the Large Text option, the text becomes larger and the login names change to full user names. Even after I disable the Large Text option back to its original off position, the text reverts back to its normal (smaller) size, but the full user names stay on the screen (exactly as I want them). However, this state is not preserved after reboot.

2. I have a feeling that this problem may be related to another one observed on my system: After system boot, many processes belonging to `gdm` user are created

I wanted to change the name before hostname on my Ubuntu terminal (the x in x@y ) To do so I replaced old x in /etc/passwd and /etc/shadow with newname

Now when I am trying to open Ubuntu, its not opening up; it is redirecting me to lock screen

Usually the users have a full name associated to them, where is that stored?

When installing Ubuntu it asked me for a name. I entered it as name (space) lastname. Now when I get to login screen, it greets me by that name. I want to change it, in fact to remove last name.

I booted up my laptop this morning to find my name no longer appears beside the power off button in the top right hand corner of the top gnome panel:

I tried deleting and re-adding the indicator applet session to the panel but it still doesn't display my name.

Any suggestions?