The following error might occur if you attempt to start PostgreSQL with the startpgsql.sh script:

Could not bind IPv6 socket: Cannot assign requested address
Is another postmaster already running on port 5432? If not, wait a few seconds and retry.

To resolve this issue, perform the following steps:

1. Ensure that no other instance of PostgreSQL is still running. To verify this, you must submit the following commands:
   ps -ef | grep post netstat -an | grep 5432
   Both commands should return no results, which indicates that no other instances of PostgreSQL are running.
   
   
2. Execute the startpgsql.sh script with an ampersand (&), according to the following example;
   ./startpgsql.sh &

Although you might still receive the error message above, if you wait 5 seconds and resubmit the ps and netstat commands, you will see that PostgreSQL is listening, which indicates that it has been started successfully.

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