[Bug 1893302] Re: SDDM freezes on system boot

[Major Oversight]

With some recent SDDM updates, I started experiencing this intermittently despite enabling linger.
After digging around for a while, the commenting out the following lines in /usr/lib/systemd/system/sddm.service seems to have cured the issue:

# Ordering
#Conflicts=plymouth-quit-wait.service
#After=systemd-user-sessions.service plymouth-start.service plymouth-quit-wait.service plymouth-quit.service systemd-logind.service
#OnFailure=plymouth-quit.service

These lines have to be commented out each time SDDM is updated as the
service file is replaced with a new version that uncomments those lines.
I am guessing that these line were added by Ubuntu/Kubuntu as the
sddm.service is somewhat different from what I could find on the project
page
(https://github.com/sddm/sddm/blob/develop/services/sddm.service.in)?

I still have "loginctl enable-linger sddm" in place, so need to test
whether disabling linger causes the issue to return with those lines in
sddm.service commented out.

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https://bugs.launchpad.net/bugs/1893302

Title:
  SDDM freezes on system boot

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