I have almost identical entries in my journalctl log, but I don't have the slowness that the OP is experiencing.
Dec 25 11:29:31 barley-cat sddm[718]: Authentication error: "Process crashed" Dec 25 11:29:31 barley-cat sddm[718]: Auth: sddm-helper crashed (exit code 15) Dec 25 11:29:31 barley-cat sddm[718]: Authentication error: "Process crashed" Dec 25 11:29:31 barley-cat sddm[718]: Auth: sddm-helper exited with 15 Dec 25 11:29:31 barley-cat sddm[718]: Socket server stopping... Dec 25 11:29:31 barley-cat sddm[718]: Socket server stopped. Dec 25 11:29:31 barley-cat sddm[718]: Display server stopping... Dec 25 11:29:31 barley-cat sddm[718]: Display server stopped. Dec 25 11:29:31 barley-cat sddm[718]: Running display stop script "/usr/share/sddm/scripts/Xstop" Dec 25 11:29:31 barley-cat sddm[718]: Removing display ":0" ... Dec 25 11:29:31 barley-cat sddm[718]: Adding new display on vt 1 ... Dec 25 11:29:31 barley-cat sddm[718]: Loading theme configuration from "" Dec 25 11:29:31 barley-cat sddm[718]: Display server starting... Dec 25 11:29:31 barley-cat sddm[718]: Adding cookie to "/var/run/sddm/{4c84cd71-7817-4c65-b807-344789cc5ab7}" Dec 25 11:29:31 barley-cat sddm[718]: Running: /usr/bin/X -nolisten tcp -auth /var/run/sddm/{4c84cd71-7817-4c65-b807-344789cc5ab7} -background none -noreset -displayfd 18 -seat seat0 vt1 Dec 25 11:29:32 barley-cat sddm[718]: Setting default cursor Dec 25 11:29:32 barley-cat sddm[718]: Running display setup script "/usr/share/sddm/scripts/Xsetup" Dec 25 11:29:32 barley-cat sddm[718]: Display server started. Dec 25 11:29:32 barley-cat sddm[718]: Socket server starting... Dec 25 11:29:32 barley-cat sddm[718]: Socket server started. Dec 25 11:29:32 barley-cat sddm[718]: Loading theme configuration from "/usr/share/sddm/themes/ubuntu-theme/theme.conf" Dec 25 11:29:32 barley-cat sddm[718]: Greeter starting... Dec 25 11:29:32 barley-cat sddm[718]: Signal received: SIGTERM Dec 25 11:29:32 barley-cat sddm[718]: Socket server stopping... Dec 25 11:29:32 barley-cat sddm[718]: Socket server stopped. Dec 25 11:29:32 barley-cat sddm[718]: Display server stopping... Dec 25 11:29:32 barley-cat sddm-helper[35033]: [PAM] Starting... Dec 25 11:29:32 barley-cat sddm-helper[35033]: [PAM] Authenticating... Dec 25 11:29:32 barley-cat sddm-helper[35033]: [PAM] returning. Dec 25 11:29:33 barley-cat sddm[718]: Display server stopped. Dec 25 11:29:33 barley-cat sddm[718]: Running display stop script "/usr/share/sddm/scripts/Xstop" Dec 25 11:29:33 barley-cat sddm[718]: QProcess: Destroyed while process ("/usr/lib/x86_64-linux-gnu/sddm/sddm-helper") is still running. Dec 25 11:29:33 barley-cat systemd[1]: sddm.service: Deactivated successfully. Dec 25 11:29:33 barley-cat systemd[1]: sddm.service: Consumed 4min 2.222s CPU time. Whether it matters, I'm running Kubuntu 22.04, fully updated. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1955747 Title: SDDM tries to restart after reboot/shutdown are initiated. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/sddm/+bug/1955747/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs