*** This bug is a duplicate of bug 1728383 ***
https://bugs.launchpad.net/bugs/1728383
This happened to me too, and I've noticed the screen flash on occasion.
No graphics card.
12:03:06 PM gnome-session-b: CRITICAL: Unable to create a DBus proxy for
GnomeScreensaver: Error calling StartServiceByName for org.gnome.ScreenSaver:
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
org.gnome.ScreenSaver exited with status 1
12:03:06 PM gnome-session-b: CRITICAL: Unable to create a DBus proxy for
GnomeScreensaver: Error calling StartServiceByName for org.gnome.ScreenSaver:
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
org.gnome.ScreenSaver exited with status 1
12:02:59 PM gnome-session-b: CRITICAL: Unable to create a DBus proxy for
GnomeScreensaver: Error calling StartServiceByName for org.gnome.ScreenSaver:
GDBus.Error:org.freedesktop.DBus.Error.Spawn.ChildExited: Process
org.gnome.ScreenSaver exited with status 1
12:02:58 PM gnome-session-b: Unrecoverable failure in required component
org.gnome.Shell.desktop
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https://bugs.launchpad.net/bugs/1717355
Title:
X11 session crashes when locked/unlocked
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