The upstream author has tested and found out that the problem only occurs with lightdm and not with gdm as desktop manager, especially the ones showing the problem are sddm, kdm, lightdm and the ones not showing the problem are gdm and lxdm. Adding desktop manager tasks ...
See this comment and following: https://github.com/OpenPrinting/system-config- printer/issues/175#issuecomment-627771765 ** Also affects: lightdm (Ubuntu) Importance: Undecided Status: New ** Also affects: sddm (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to system-config-printer in Ubuntu. https://bugs.launchpad.net/bugs/1877528 Title: Applet does not terminate at end of X desktop session Status in System Config Printer: New Status in lightdm package in Ubuntu: New Status in sddm package in Ubuntu: New Status in system-config-printer package in Ubuntu: Triaged Bug description: This concerns system-config-printer 1.5.12-0ubuntu1 in Ubuntu focal. I log into the Xfce desktop, and then logout. The screen returns to the LightDM login screen. A few minutes later, "loginctl list-sessions" shows the following: SESSION UID USER SEAT TTY 9 0 root c2 1000 skunk seat0 c3 116 lightdm seat0 3 sessions listed. Output from "loginctl session-status c2": c2 - skunk (1000) Since: Fri 2020-05-08 03:09:05 EDT; 9min ago Leader: 2530 Seat: seat0; vc7 Display: :0 Service: lightdm; type x11; class user Desktop: xubuntu State: closing Unit: session-c2.scope └─2856 /usr/bin/python3 /usr/share/system-config-printer/applet.py This process sticks around forever until I kill it, or its parent "systemd --user" process. Only then does the session disappear from list-sessions. When I run "session-status" while I'm logged in, I see a list of nearly 30 desktop-related processes. All of them except this one go away on logout. This one should too. To manage notifications about this bug go to: https://bugs.launchpad.net/system-config-printer/+bug/1877528/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
