I am yet another (desktop) user who has run into this bug last weekend.
I set up my laptop some months ago with ubuntu studio 24.04 and added XFCE 
since I use Xubuntu since 2008.

Terminal output for "SNAPD_DEBUG=1 snap run firefox" is attached.

Changing the DBUS_SESSION_ADDRESS does not help and neither does removing, 
purging and reinstalling firefox. 
I can only start firefox (or any other snap) as sudo after setting xhost + 
local: (which is a bad idea, I know).
When I start Discover, I get a warning that the authentication failed and I am 
not able to install anything using Discover. 

The most interesting part: 
I got into this when I started to try to setup the fingerprint sensor which 
(according to spec) should be part of my laptop, but as it turns out cannot be 
found.
Since I started to configure libpam-fprintd and have the problem since then, I 
strongly support Tim Richardson's theory that this is related to a skipped step 
during the login which has something to do with pam.

For reproduction I propose to:
+ install ubuntu studio with plasma desktop
+ sudo apt install xubuntu-desktop
+ login to your Xubuntu or XFCE desktop using lightdm
+ sudo apt update && sudo apt upgrade -y
+ sudo apt install fprintd libpamfprintd
+ sudo pam-auth-update
+ select lightdm as session manager
+ don't change anything on the selection page for the authentication method and 
close the configuration wizard

Since a fix is not in sight since 5 years and none of the displayed workarounds 
help, I guess I have to setup my whole laptop again on the weekend.
If any additional logs are needed, I'm glad to (get) help.



** Attachment added: "debug_output.txt"
   
https://bugs.launchpad.net/ubuntu/+source/snapd/+bug/1951491/+attachment/5942516/+files/debug_output.txt

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https://bugs.launchpad.net/bugs/1951491

Title:
  Can't run snaps: .slice/session-1.scope is not a snap cgroup

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