appmenu-gtk3-module described after reinstallation: GtkMenuShell D-Bus exporter (GTK+3.0)

grahamperrin@mowa219-gjp4 ~> sudo apt install appmenu-gtk3-module
The following package was automatically installed and is no longer required:
  libunity-gtk3-parser0
Use 'sudo apt autoremove' to remove it.

Installing:
  appmenu-gtk3-module

Installing dependencies:
  appmenu-gtk-module-common  libappmenu-gtk3-parser0

REMOVING:
  unity-gtk3-module

Summary:
  Upgrading: 0, Installing: 3, Removing: 1, Not Upgrading: 2
  Download size: 45.3 kB
  Space needed: 132 kB / 456 GB available

Continue? [Y/n] y
Get:1 http://gb.archive.ubuntu.com/ubuntu questing/universe amd64 appmenu-gtk-module-common all 25.04-1 [5,246 B]
Get:2 http://gb.archive.ubuntu.com/ubuntu questing/universe amd64 libappmenu-gtk3-parser0 amd64 25.04-1 [25.5 kB]
Get:3 http://gb.archive.ubuntu.com/ubuntu questing/universe amd64 appmenu-gtk3-module amd64 25.04-1 [14.6 kB]
Fetched 45.3 kB in 0s (668 kB/s)
(Reading database ... 382840 files and directories currently installed.)
Removing unity-gtk3-module:amd64 (0.0.0+18.04.20171202-0ubuntu7) ...
Selecting previously unselected package appmenu-gtk-module-common.
(Reading database ... 382837 files and directories currently installed.)
Preparing to unpack .../appmenu-gtk-module-common_25.04-1_all.deb ...
Unpacking appmenu-gtk-module-common (25.04-1) ...
Selecting previously unselected package libappmenu-gtk3-parser0:amd64.
Preparing to unpack .../libappmenu-gtk3-parser0_25.04-1_amd64.deb ...
Unpacking libappmenu-gtk3-parser0:amd64 (25.04-1) ...
Selecting previously unselected package appmenu-gtk3-module:amd64.
Preparing to unpack .../appmenu-gtk3-module_25.04-1_amd64.deb ...
Unpacking appmenu-gtk3-module:amd64 (25.04-1) ...
Setting up appmenu-gtk-module-common (25.04-1) ...
Setting up libappmenu-gtk3-parser0:amd64 (25.04-1) ...
Processing triggers for libglib2.0-0t64:i386 (2.86.0-2ubuntu0.1) ...
Processing triggers for libglib2.0-0t64:amd64 (2.86.0-2ubuntu0.1) ...
Processing triggers for libc-bin (2.42-0ubuntu3) ...
Setting up appmenu-gtk3-module:amd64 (25.04-1) ...
grahamperrin@mowa219-gjp4 ~> apt info appmenu-gtk3-module
Package: appmenu-gtk3-module
Version: 25.04-1
Priority: optional
Section: universe/libs
Source: appmenu-gtk-module
Origin: Ubuntu
Maintainer: Ubuntu Developers <[email protected]>
Original-Maintainer: Ayatana Packagers <[email protected]>
Bugs: https://bugs.launchpad.net/ubuntu/+filebug
Installed-Size: 60.4 kB
Provides: appmenu-gtk3
Depends: libappmenu-gtk3-parser0 (>= 25.04-1), libc6 (>= 2.4), libglib2.0-0t64 (>= 2.80.0), libgtk-3-0t64 (>= 3.22.0), appmenu-gtk-module-common (>= 25.04-1)
Conflicts: appmenu-gtk3
Replaces: appmenu-gtk3
Homepage: https://github.com/rilian-la-te/vala-panel-appmenu/tree/master/subprojects/appmenu-gtk-module
Task: kubuntu-desktop, kubuntu-full, ubuntustudio-desktop, ubuntustudio-desktop-core, ubuntu-mate-core, ubuntu-mate-desktop, ubuntu-budgie-desktop-minimal, ubuntu-budgie-desktop, ubuntu-budgie-desktop-raspi
Download-Size: 14.6 kB
APT-Manual-Installed: yes
APT-Sources: http://gb.archive.ubuntu.com/ubuntu questing/universe amd64 Packages
Description: GtkMenuShell D-Bus exporter (GTK+3.0)
 GTK+ module for exporting old-style menus as GMenuModels.
 .
 Many applications implement menus as GtkMenuShells and GtkMenuItems and
 aren't looking to migrate to the newer GMenuModel API.
 .
 The AppMenu GTK+ module watches for these types of menus and exports the
 appropriate GMenuModel implementation.
 .
 This package contains the GTK+3.0 AppMenu module.

grahamperrin@mowa219-gjp4 ~> apt autoremove
Error: Could not open lock file /var/lib/dpkg/lock-frontend - open (13: Permission denied)
Error: Unable to acquire the dpkg frontend lock (/var/lib/dpkg/lock-frontend), are you root?
grahamperrin@mowa219-gjp4 ~ [100]> sudo apt autoremove
REMOVING:
  libunity-gtk3-parser0

Summary:
  Upgrading: 0, Installing: 0, Removing: 1, Not Upgrading: 2
  Freed space: 88.1 kB

Continue? [Y/n] y
(Reading database ... 382852 files and directories currently installed.)
Removing libunity-gtk3-parser0:amd64 (0.0.0+18.04.20171202-0ubuntu7) ...
Processing triggers for libc-bin (2.42-0ubuntu3) ...
grahamperrin@mowa219-gjp4 ~>