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There can be several reasons why Npgsql PostgreSQL Data Provider is absent from the Entity Framework 6 Data Sources. Some of the possible reasons are:

1. Incorrect installation: If the Npgsql PostgreSQL Data Provider is not installed or not installed properly, then it may not be visible in the Entity Framework 6 Data Sources.

2. Incompatible versions: Entity Framework 6 may not support the version of the Npgsql PostgreSQL Data Provider that is installed. In such cases, the provider may not be visible in the Data Sources.

3. Missing configuration: It is possible that the Npgsql PostgreSQL Data Provider is installed but not configured properly. This can cause the provider to be absent from the Data Sources.

4. Limited availability: Entity Framework 6 Data Sources only show providers that are commonly used. Therefore, the Npgsql PostgreSQL Data Provider may not be visible if it is not widely used.

To resolve these issues, you can try reinstalling the Npgsql PostgreSQL Data Provider, ensuring compatibility with Entity Framework 6, configuring it properly, or looking for alternative ways to integrate with Entity Framework.