Another W for Signal

Can only guess, but nixpkgs says the package provided is org.gnome.decibels not decibels. Maybe try this command

It is called pkgs.decibels. Should be feasible if you just did

  environment.gnome.excludePackages = [
    pkgs.decibels
  ];

Ubuntu -> Mint -> Arch -> NixOS

Ubuntu really drove me away for some time. Only when I got to Mint, I felt that Linux could be a daily driver. Arch made me strangely reinstall it every few days. Not by not working but by having the feeling of dirtying the machine on use.

NixOS is really what I want to use the rest of my life. Very complicated on first use but definitly worth it (for me).

After (it) is honored, (it) is desired?