I am working in company where about 35% of users are on Windows, 40% on Linux and 25% on Mac. In Linux, official way to use MS Office is web apps, but Libreoffice is quite heavily used too.

Wild guess. Libspa version has changed and thus its path too. You will have to put (probsbly new version) of aac.so file to new libspa directory.

Yeah, it might require new one if dependencies have been changed.

Note. Before rebooting, regenerate initramfs for all kernel versions. I am not in debian, but dpkg-reconfigure initramfs-tools might do it.

What filesystem is in use where lotro files are stored?

I am a Finn. How I can tell if I am delightfully or some other way weird?

Vim + vimwiki is what I use, with session saving plugin. That is all I need. For syncing, I use either git or syncthing.