GNU/Linux Fedora 31 Install PostgreSQL 12 – Step by step Guide
How to Install PostgreSQL 12 in Fedora 31 GNU/Linux – Step by step Tutorial.
And to Install PostgreSQL 12 for Fedora 31 you have first to setup the dnf Repository.
Moreover, PostgreSQL 12 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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1. Launching Terminal
Open a Shell Terminal emulator window
(Press “Enter” to Execute Commands)Or Login Server Shell.
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