When starting Postgresql on Ubuntu ( Windows Subsystem), there might be an error that says: data directory "/var/lib/posgresql/10/main has a group or world access. This is not advisable because of the folder containing the data should be secure.
Solution:
This command: sudo chmod 700 -R /var/lib/postgresql/10/main Then: sudo service postgresql start (this command starts the postgresql database engine)
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