In the article "How to install Firebird 3.0 and 4.0 on Linux" you can find the installation instruction for Firebird versions 3 and 4 on the popular Linux versions: CentOS 7, Oracle Linux 7/8, Debian 9/10, Ubuntu18/20, and OpenSUSE15.0.

How to install Firebird 3.0 and 4.0 on Linux

Firebird Project is happy to announce general availability of Firebird 4.0.2 — the second point release in the Firebird 4.0 series.

This sub-release offers many bug fixes and also adds a few improvements, please refer to the Release Notes for the full list of changes.
Binary kits for Windows, Linux and Android platforms are immediately available for download.

To enhance the Firebird functionality, IBSurgeon has sponsored the development and now released for public use the free open source "IBSurgeon Full Text Search UDR" to perform full text search queries within SQL and PSQL. UDR works with Firebird 3 and 4, for Windows there are ready-to-use binaries, for Linux it is necessary to build the UDR.

The UDR is based on Lucene++ engine, with all the powerful features required for full text search and with very fast performance (build as native C++ library).

The binaries of IBSurgeon Full Text Search UDR, its sources, and documentation are available on GitHub https://github.com/IBSurgeon/lucene_udr

Please download, read documentation, use, provide feedback (via GitHub Issues) and join to its group in Telegram (support and development).

And don't forget to mark it with star on GitHub!