Once I was using PostgreSQL and when I no longer need to keep the installation, I wanted to remove it completely.
So I used the command listed below to remove the PostgreSQL.
#sudo apt-get --purge remove postgresql
Even though the un-installation was successful, when I go to login there's still a "PostgreSQL" user. I tried running sudo deluser PostgreSQL but all I get is
/usr/sbin/deluser: The user `PostgreSQL' does not exist.
In order to verify the existence of the user, I checked the passwd file.
cat /etc/passwd | grep -i postgre
postgres:x:1001:1001:PostgreSQL:/opt/ManageEngine/OpManager/pgsql:/bin/sh
Then only I realized that the Login Name and User Name are not the same. So I tried removing the user "postgres" using the command below and it was successful.
sudo deluser postgres
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