GNU/Linux Fedora 30 Install PostgreSQL 11 – Step by step Guide
How to Install PostgreSQL 11 on Fedora 30 GNU/Linux – Step by step Tutorial.
And PostgreSQL 11 for Fedora 30 is a Major Release that contains several substantial Changes and Improvements.
Moreover, PostgreSQL 11 contains a number of Extensive Changes that May affect Compatibility with Previous Releases.
Especially relevant: A dump/restore using pg_dumpall, or use of pg_upgrade, is Required for those wishing to Migrate Data from PostgreSQL 9 and Below.

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Open a Shell Terminal emulator window
Start Typing ‘term’ on desktop.
(Press “Enter” to Execute Commands) -
Install PostgreSQL 11 Repository for Fedora 30
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Finally, to Install PostgreSQL 11 for Fedora 30.
sudo dnf install postgresql11-server postgresql11-contrib
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How to Getting Started with PostgreSQL 11 Admin