The problem seems to be that home.stateVersion is not set because you commented out both the declaration in flake.nix as well as the line that imports home.nix. It’s a bit difficult to see whether the config is otherwise fine since there is a lot of visual clutter due to all the commented-out lines.

First, you need to pass the plasma-manager input to your home-manager config in some way. I use the NixOS module for home-manager which I declare like this in my flake.nix (if you have a different setup, this might not be necessary or you have to do it in a slightly different way):

homeManagerModule = {
  imports = [home-manager.nixosModules.home-manager];
  home-manager.users.myusername = import ./home.nix;
  # This will give us access to the inputs in the home-manager config
  home-manager.extraSpecialArgs = {inherit inputs};
};

Now the home-manager config (in my case home.nix) can look like this:

{
  inputs,
  ...
}: {
  imports = [inputs.plasma-manager.homeManagerModules.plasma-manager];
  programs.plasma = {
    enable = true;
    # ...
}

You probably forgot to import the plasma-manager module into home-manager. If you want to have a cleaner setup, I’d also recommend against just copying the complete output of rc2nix into your config since it tends to contain a lot of unnecessary stuff. What I usually do is:

1. Store the current config in a file, i.e. rc2nix > old-config.nix
2. Make whatever changes I want in Plasma in the graphical settings app
3. Store the updated config in a new file, i.e. rc2nix > new-config.nix
4. Get the difference, i.e. diff old-config.nix new-config.nix and add what I want to my actual plasma-manager config.

This of course only works if you’re starting from a relatively unmodified installation of KDE, but in that case it’s worth the effort imo.

Honestly, instead of trying to remove Snap from Ubuntu, I’d just install another distro (PopOS for example is mostly like Ubuntu but with Flatpak instead of Snap)

That really depends on how exactly the public broadcasting is funded. In Germany for example, this happens independently from other state expenses so there’s no way that the government can directly controll the press. For this reason, the press tends to be critical of all political parties, including the ones currently in government.

From Wikipedia:

Fascism is a far-right, authoritarian, ultranationalist political ideology and movement, characterized by a dictatorial leader, centralized autocracy, militarism, forcible suppression of opposition, belief in a natural social hierarchy, subordination of individual interests for the perceived good of the nation and race, and strong regimentation of society and the economy.

The only part that could vaguely be associated with capitalism (in a democratic country) is “militarism” and even then this is only the case if you mainly focus on the USA. The fact that fascist countries were running free-market economy is also not really a point since that was (and is) the case for a large part of the world.

“subordination of personal interest” and “strong regimentation of […] the economy” is the opposite of prototypical uncontrolled capitalism. Saying that capitalism is fascism is just as stupid as saying that fascism and socialism are the same (“bUT it wAs cALLed naTIOnaL soCiaLIsm”). Using the word “fascism” for everything you don’t like just makes it lose all meaning.

I’ve started writing a NixOS config to replace the Ubuntu install that I currently have on my server. I’m starting to question if it makes sense though, since the Nextcloud Snap is very convenient (it even includes a backup/restore script) and I don’t know if I’ll be able to easily replicate all of that easily using the NixOS module.

I think Plex is not open source but is there any reason against Jellyfin? As far as I know, they also have apps for most smart TVs in case that’s what you mean by navigating with a remote.

In my experience, a good way to get a polished desktop with a tiling workflow is to use KDE / GNOME with a few extensions & i3 shortcuts. Unless you really care about customizing every part of your DE, the work of configuring i3 to match a proper DE in terms of polish might not be worth it.

I previously used GNOME with the Forge extension and a few simple extensions for a workspace indicator, disabling the workspace switch animation, etc. This worked quite well but since GNOME is not very configurable, you have to do a lot of that through extensions (e.g. disabling the workspace switch animation & popup). This is particularly annoying since GNOME updates tend to break extensions.

For that reason, I recently switched to KDE. Polonium is a very nice tiling plugin for it. Since KDE is pretty customizable, I didn’t really need a lot of other extensions to support my workflow. It’s mainly a matter of configuring keyboard shortcuts and a few other settings. I haven’t used KDE long enough to say how stable everything is under updates, but from what I’ve heard it should be a lot better than GNOME.

I personally use NixOS and Home Manager with the Plasma Manager module for KDE. It’s a steep learning curve but if you have fun learning new stuff it is worth it in my opinion.

Otherwise, a GNOME / KDE tiling setup will probably also be mostly reproducible if you just track your dot files. There’s always a bit of manual configuration but it’s also difficult to completely avoid that with NixOS (although probably possible).