WARNING: could not flush dirty data: Function not implemented

From: Ravi Krishna <sravikrishna(at)aol(dot)com>
To: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: WARNING: could not flush dirty data: Function not implemented
Date: 2018-09-02 22:57:55
Message-ID: 1301077575.68539.1535929075959@mail.yahoo.com
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Ubuntu 18.04 as Windows bash

Distributor ID: Ubuntu
Description: Ubuntu 18.04.1 LTS
Release: 18.04
Codename: bionic

PG 10.5.1

postgres(at)ravi-lenovo:~$ psql -d postgres
psql (10.5 (Ubuntu 10.5-1.pgdg16.04+1))

A CREATE DATABASE statement spewed out

WARNING: could not flush dirty data: Function not implemented

many times, but the db was created.

What exactly is this?

A simple search tells that this is an old problem and my Windows has necessary WSL and other subsystem for this error to not show up.

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