Describe the bug

After logging in with SDDM I see the following window:

Every time. This is annoying and should not happen. Previously, no manual intervention was necessary. This is a regression in 20.03.

To Reproduce

Steps to reproduce the behavior:

1. Switch to nixpkgs b2935fbeceaea0b64df4401545d7c8ea29102120. Set SDDM as your display manager and plasma5 as your desktop manager. Like so:

  services.xserver = {
    enable = true;
    layout = "us";
    libinput.enable = true;

    desktopManager = {
      plasma5.enable = true;
    };

    displayManager = {
      sddm.enable = true;
      defaultSession = "plasma5";
    };
  };

2. Reboot or I guess just logging out and then logging in again will do.
3. Observe the above-mentioned window.

Expected behavior

No manual intervention should be necessary.

Metadata

• system: "x86_64-linux"
• host os: Linux 5.4.25, NixOS, 20.03.git.b2935fbecea (Markhor)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.4pre7250_94c93437
• channels(mark): "nixos-18.09.2337.5d972dd2c94"
• channels(root): "nixos-19.03.173651.ca6b6595392"
• nixpkgs: /home/mark/nixpkgs