I have this issue too.
The dpkg.log shows as bellow:
upgrade linux-libc-dev:amd64 4.15.0-23.25 4.15.0-24.26
upgrade gnome-control-center-data:all 1:3.28.1-0ubuntu1.18.04.1
1:3.28.1-0ubunt1.18.04.2
upgrade gnome-control-center:amd64 1:3.28.1-0ubuntu1.18.04.1
1:3.28.1-0ubunt1.18.04.2
upgrade gnome-control-center-faces:all 1:3.28.1-0ubuntu1.18.04.1
1:3.28.1-0ubunt1.18.04.2
upgrade linux-generic:amd64 4.15.0.23.25 4.15.0.24.26
upgrade linux-image-generic:amd64 4.15.0.23.25 4.15.0.24.26
upgrade linux-headers-generic:amd64 4.15.0.23.25 4.15.0.24.26
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https://bugs.launchpad.net/bugs/1779827
Title:
Started gnome display manager. dispatcher service
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