yum fails with "All matches were filtered out by modular filtering" in RHEL 8 / CentOS 8 / Oracle Linux 8

 Installation of packages is failing due this error in RHEL 8.

Error:

 'postgresql10 All matches were filtered out by modular filtering for argument: postgresql10'

No package postgresql10 available.

This issue is caused as  yum fails to find or install non-modular content when a module provides the same package. 

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Solution:

Modular packages can only be installed from Enabled or Default modules. To identify what module:stream a package is part of, use yum module provides

#yum module provides postgresql10

If you want install the package from another source, then "disable" the module first and then install the package.

dnf module enable -y postgresql10

If want to install from the module then enable the module.

dnf module enable -y postgresql10