I've got the same errors, on fresh Ubuntu 16.04.
Most concerning, the machine reboots itself. Afterwards, my /var/log/syslog contains errors like:
org.gnome.zeitgeist.Engine[7583]: ** (zeitgeist-datahub:8812): WARNING **: zeitgeist-datahub.vala:212: Error during inserting events: GDBus.Error:org.gnome.zeitgeist.EngineError.InvalidArgument: Incomplete event: interpretation, manifestation and actor are required
> uname -a
Linux Tapuaetai 4.10.0-38-generic #42~16.04.1-Ubuntu SMP Tue Oct 10 16:32:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
I've got the same errors, on fresh Ubuntu 16.04.
Most concerning, the machine reboots itself. Afterwards, my /var/log/syslog contains errors like:
org.gnome. zeitgeist. Engine[ 7583]: ** (zeitgeist- datahub: 8812): WARNING **: zeitgeist- datahub. vala:212: Error during inserting events: GDBus.Error: org.gnome. zeitgeist. EngineError. InvalidArgument : Incomplete event: interpretation, manifestation and actor are required
> uname -a
Linux Tapuaetai 4.10.0-38-generic #42~16.04.1-Ubuntu SMP Tue Oct 10 16:32:20 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux