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.

How to know if you are old:

First thing which comes to mind from DDR is not game about dancing or computer memory, but Deutsche Demokratische Republik (DDR).

https://en.wikipedia.org/wiki/East_Germany

Excellent news.

Congrats for a good working system. Lenovo professional range laptops are usually working quite well with Linux, just use recent enough Linux version.

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?

If computers are in same network, even with different ip addresses, they still can see all broadcast and multicast traffic. This means for example dhcp.

If you fully trust your computers, and are sure that no external party can access any of them, you should be fine. But if anyone can gain access to any of your computers, it is trivial to gain access and sniff traffic in all networks.

If you need best security, multiple switches and multiple nics are unfortunately only really secure solution.

Luks FDE, and install dropbear-initramfs, configure ssh authorized_keys and rebuild initramfs. Then you can access initramfs via ssh to type luks password.

If you just rename the dir, and then find all broken symlinks in your system?

find . -xtype l

The C64 Mini and C64 Maxi are readily available today and affordably priced, making spare parts easily accessible.

If those work well enough for them, I cannot see any benefit of upgrading.

I think right side is delay timer, and left is runtime. Test it by putting dial just to right, and wait when it reaches zero it should start heating.