I intended to find a petition on this topic

Maybe this is close to what you are looking for?

Petition No 0729/2024 by N. W. (Austrian) on the implementation of an EU-Linux operating system in public administrations across all EU countries

You may be interested in the EU OS for the public sector, Proof-of-Concept for the deployment of a Fedora-based Linux operating system with a KDE Plasma desktop environment.

There is also the Open Source Strategy of Schleswig-Holstein, a northern German state, that has unveiled an ambitious plan to break free from proprietary software dependencies by ditching Microsoft for Linux and LibreOffice.

I would say that it is absolutely irrelevant whether or not Putin agrees to anything, because he won’t stick to his word anyway.

I feel somehow this ‘news’ is more an opener to promote the petition at the end of the article than anything else. Not that I oppose a new tax regime for the ultra-rich individuals, but there is no sophisticated content here imho.