APT upgrade on Neon asks selecting Default display manager. plasmalogin or sddm?

Help
1

During today’s KDE Neon “sudo apt full-upgrade”, there was a screen:

Package configuration
  ┌─────────────────────────────────────────────────────────────────────────────────────────────────────┤ Configuring plasmalogin ├─────────────────────────────────────────────────────────────────────────────────────────────────────┐
  │ A display manager is a program that provides graphical login capabilities for the X Window System.                                                                                                                                  │ 
  │                                                                                                                                                                                                                                     │ 
  │ Only one display manager can manage a given X server, but multiple display manager packages are installed. Please select which display manager should run by default.                                                               │ 
  │                                                                                                                                                                                                                                     │ 
  │ Multiple display managers can run simultaneously if they are configured to manage different servers; to achieve this, configure the display managers accordingly, edit each of their init scripts in /etc/init.d, and disable the   │ 
  │ check for a default display manager.                                                                                                                                                                                                │ 
  │                                                                                                                                                                                                                                     │ 
  │ Default display manager:                                                                                                                                                                                                            │ 
  │                                                                                                                                                                                                                                     │ 
  │                                                                                                            plasmalogin                                                                                                              │ 
  │                                                                                                            sddm                                                                                                                     │ 
  │                                                                                                                                                                                                                                     │ 
  │                                                                                                                                                                                                                                     │ 
  │                                                                                                               <Ok>                                                                                                                  │ 
  │                                                                                                                                                                                                                                     │ 
  └─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┘

as a layman I am wondering what to select. I assume that the option that is selected is highlighted using red background. (which in my case is sddm)

$ kinfo

Operating System: KDE neon User Edition
KDE Plasma Version: 6.6.5
KDE Frameworks Version: 6.26.0
Qt Version: 6.11.1
Kernel Version: 6.17.0-35-generic (64-bit)
Graphics Platform: Wayland

AI claims:

Your kinfo output confirms you are running KDE Plasma 6 on Wayland. SDDM (Simple Desktop Display Manager) is the standard, recommended display manager for all modern KDE installations. It handles the graphical login screen and starts your desktop session.

While plasmalogin is listed, it is typically just a compatibility layer or legacy option. Sticking with sddm ensures full feature support and stability for your specific setup.

2

Use whichever you want. Plasma Login Manager is working great for me, so I think it’s worth trying. Remember it’s still rather young so it may not have all the features you may require.

3

this 6.7.0 plasma update fuked my neon (actually, two installations).

no matter which option i selected, it uninstalled sddm and xinit from my system. could not login to plasma after restart, but i could switch to shell (ctrl+ alt + Fkey).

then, this fixed it:

sudo pkcon refresh

sudo pkcon repair

sudo apt update

sudo apt install sddm xinit -y

sudo systemctl enable sddm

4

Not sure how this is related.

5

I am wondering which distinctive features it may have, I didn’t notice any difference.
First thing I did after enabling was for some fancy config options, but no luck :slight_smile:

Works fin, BTW

6

You should have no problem using SDDM, but the LLM output is misleading here.

Plasma Login Manager definitely isn’t a “compatibility layer” or a legacy choice - it’s new as of Plasma 6.6.

7

do not ask LLMs for help unless you like being misinformed, exhibit yet another

8

it happened after this exact update & “which login manager” question, that’s how it’s related.

btw i am using X11, but those who use wayland seem unaffected.

9

Yes, I am on Wayland and selected sddm in the display manager selection window. System/KDE started without problem.