You can follow the official installation instructions to get LibreOffice on Linux. You will not find it as a separate software - but as a part of the LibreOffice suite. LibreOffice is free, open source, and comes bundled with most of the distributions.
In case you’re curious, we also have a detailed article on how to edit PDF files using LibreOffice Draw. It may not be a full-fledged PDF editor and comes with some limitations but it’s worth trying out. If your requirements are limited and mostly text editing in a PDF document, Draw will serve your purpose. LibreOffice draw provides a handy way of editing a PDF file. Just to be clear, I’ve originally tested these tools on Pop OS 20.04, but you can easily try them on other Linux distributions as well. Best PDF Editors for Linux to Edit Content They have been included in the context of Linux usage. Non-FOSS Warning! Some of the applications mentioned here are not open source.
