I used OnlyOffice via native .deb package. And yes it broke my apt every time and on every update. I managed by manually editing install scripts to make it work. I never used docker before but want give it a try (maybe podman instead). You can also write your problem and questions to !selfhosted@lemmy.world community, maybe they can help you

Is there any samples to try and check if it works?

On Windows it is really sometimes slow for some reason, but on all my Linux devices it works well. Even on cheap laptop

I think yes, especially for making presentations

Did you mean forms mode?

You should try OnlyOffice. It is very similar to MS Office and fully compatible with Microsoft formats. It has fully replaced MS Office for me for all office work. Also it can be easely integrated with your private NextCloud. You can install it from Flathub.

Edit: it also lets you edit and convert pdfs like Adobe Acrobat Pro

Always use /dev/urandom for this purposes. /dev/random will be locked if it doesn’t have enough entropy. It is good for getting some random kilobytes for cryptography but not 2 TB of random data for disk wipe.