update-manager: WARNING:root:can not import unity GI Namespace Dbusmenu not available

On advice by Manfred Hample I did

willem@Xubuntu-18-04:~$ sudo apt install gir1.2-unity-5.0

And got:

Pakketlijsten worden ingelezen... Klaar
Boom van vereisten wordt opgebouwd
De statusinformatie wordt gelezen... Klaar
De volgende extra pakketten zullen geïnstalleerd worden:
  gir1.2-dbusmenu-glib-0.4 gir1.2-dee-1.0
De volgende NIEUWE pakketten zullen geïnstalleerd worden:
  gir1.2-dbusmenu-glib-0.4 gir1.2-dee-1.0 gir1.2-unity-5.0
0 opgewaardeerd, 3 nieuw geïnstalleerd, 0 te verwijderen en 0 niet opgewaardeerd.
Er moeten 39,3 kB aan archieven opgehaald worden.
Na deze bewerking zal er 258 kB extra schijfruimte gebruikt worden.

Then ran:

sudo update-manager

The warning did not show up anymore.

Just did another run of update-manager.
Started with sudo update-manager.
It ran without any messages in cli, then when the dialogue came up telling me there were updates, I got this in cli:

willem@Xubuntu-18-04:~$ sudo update-manager
[sudo] wachtwoord voor willem:
WARNING:root:Error loading .desktop file /usr/share/applications/gnome-sudoku.desktop: constructor returned NULL

(NO idea at all what sudoku is doing there, but there you go.)

I closed the dialogue and reran without sudo:

Then got this again:

willem@Xubuntu-18-04:~$ update-manager

** (update-manager:13604): WARNING **: 19:06:35.605: Couldn't register with accessibility bus: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

closed the dialogue telling me about the updates again and redid:

sudo update-manager

When the dialogue about the updates appeared cli again showed the sudoku-message.

It seems there is still an issue?

The sudoku-message may have been triggered by the fact that sudoku was part of the upgrade

sudo grep "sudoku" dpkg.log

2018-03-11 19:08:55 upgrade gnome-sudoku:amd64 1:3.27.3-1build3 1:3.28.0-1
2018-03-11 19:08:55 status half-configured gnome-sudoku:amd64 1:3.27.3-1build3
2018-03-11 19:08:55 status unpacked gnome-sudoku:amd64 1:3.27.3-1build3
2018-03-11 19:08:55 status half-installed gnome-sudoku:amd64 1:3.27.3-1build3
2018-03-11 19:08:56 status half-installed gnome-sudoku:amd64 1:3.27.3-1build3
2018-03-11 19:08:56 status half-installed gnome-sudoku:amd64 1:3.27.3-1build3
2018-03-11 19:08:56 status half-installed gnome-sudoku:amd64 1:3.27.3-1build3
2018-03-11 19:08:56 status unpacked gnome-sudoku:amd64 1:3.28.0-1
2018-03-11 19:08:56 status unpacked gnome-sudoku:amd64 1:3.28.0-1
2018-03-11 19:08:56 configure gnome-sudoku:amd64 1:3.28.0-1 <none>
2018-03-11 19:08:56 status unpacked gnome-sudoku:amd64 1:3.28.0-1
2018-03-11 19:08:56 status half-configured gnome-sudoku:amd64 1:3.28.0-1
2018-03-11 19:08:56 status installed gnome-sudoku:amd64 1:3.28.0-1

Did another sudo-update manager run.
Got:

illem@Xubuntu-18-04:~$ sudo update-manager
[sudo] wachtwoord voor willem:
WARNING:root:Error loading .desktop file /usr/share/applications/gnome-mines.desktop: constructor returned NULL

gnome-mines was one of the applications which needed to be updated.

Did an sudo update-manager from cli again; Whilst in the update-manager I clicked on one of the links which referred me to the bug that was being repaired by the update; firefox did not start immediately; then it did. In cli I then had a load of messages. See attachtment.

Is this something different do you think?