I got it. On Ubuntu 18.04 I have been running pgadmin4 in desktop mode for a long time. Today I "apt install pgadmin4-apache2" but can not log in, nor find the user management dialog. The "apt install pgadmin4-apache2" process did not prompt me for an initial user and password. I removed pgadmin4 and pgadmin4-apache2 and reinstalled and this time was prompted for the initial user & password. Thanks Melvin and Murtuza for your replies.
A. down click on Login/Group Roles and you will see all the users and/or roles OR B. right click on Login/Group Roles and you will see the option to Create Then place the cursor on Create and you will see the option for Login/Group Role...
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