Uninstall postgresql completely from Linux

I installed postgres from postgresql-9.4.1-1-linux-x64.run file.

I want to remove postgres completely from my system. I deleted the data
directory file.

Now When I am installing it again, I am getting the below output :

----------------------------------------------------------------------------
Welcome to the PostgreSQL Setup Wizard.

----------------------------------------------------------------------------
Existing installation

An existing PostgreSQL installation has been found at /home/postgres9.4.1.
This
installation will be upgraded.

In order to upgrade, we may need to restart the server. All connections to
the
server will need to be reestablished after the completion of the
installation
process.
Press [Enter] to continue:

----------------------------------------------------------------------------
Please select a directory under which to store your data.

Data Directory []:

This means postgres is not completely removed. How to remove it completely
because I need a fresh installation.

I uninstalled PostgreSQL by following :

[root(at)ZetaSearch02 postgres9.4.1]# ./uninstall-postgresql
Do you want to uninstall PostgreSQL and all of its modules? [Y/n]: Y

----------------------------------------------------------------------------
Uninstall Status

Uninstalling PostgreSQL
0% ______________ 50% ______________ 100%
########################################Warning: The data directory
(/root/postgres/data) and service user account
(postgres) have not been removed.
Press [Enter] to continue:
#

Info: Uninstallation completed
Press [Enter] to continue:

----------

Now when I run the file again it is giving me the same output:

./postgresql-9.4.1-1-linux-x64.run
----------------------------------------------------------------------------
Welcome to the PostgreSQL Setup Wizard.

----------------------------------------------------------------------------
Existing installation

An existing PostgreSQL installation has been found at /home/postgres9.4.1.
This
installation will be upgraded.

In order to upgrade, we may need to restart the server. All connections to
the
server will need to be reestablished after the completion of the
installation
process.
Press [Enter] to continue:
[root(at)ZetaSearch02 postgres]#
[root(at)ZetaSearch02 postgres]#
[root(at)ZetaSearch02 postgres]# cd /home/postgres9.4.1
-bash: cd: /home/postgres9.4.1: No such file or directory

Please let me know what to do?

Warm Regards,

Vivekanand Joshi
+919654227927

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