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

Here I take micro-retirement of 4 weeks every summer, plus one week in wintertime.

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

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.

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

find . -xtype l

They are still on the ship, and cannot get to land because of the lack of visas.

Do you mean upgrade or reinstall?

I have done release upgrades in multiple occasions all the way from 16.04 -> 18.04 -> 20.04 -> 22.04 -> 24.04. Usually they work fine, but of course back up your stuff first. When doing it with release-upgrade all your stuff is of course kept just like before.

Basically just:

sudo apt update

sudo apt dist-upgrade

sudo reboot

sudo do-release-upgrade

This will upgrade to 22.04. After upgrade just repeat process to upgrade to 24.04

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.

Can you access your wan ip when you are somewhere else than on your own lan?

If not, then this is probably just that your router does firewalling and nat is such order that you can access admin interface from local network via wan address.

If yes, then router has some serious misconfiguration.