World clock plasmoid can't be launched in Kubuntu 18.04

[Pacific Seascape]

I am unable to add the World Clock plasmoid to any of my desktops. I always get the following error:

Error loading QML file: file:///usr/share/plasma/plasmoids/org.kde.plasma.worldclock/contents/ui/main.qml:26:1: module "org.kde.marble.private.plasma" is not installed

I have Marble installed, but that seems not to matter.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: plasma-workspace 4:5.12.6-0ubuntu0.1
ProcVersionSignature: Ubuntu 4.15.0-36.39-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7.4
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Oct 4 07:37:58 2018
EcryptfsInUse: Yes
ExecutablePath: /usr/bin/plasmashell
InstallationDate: Installed on 2018-08-22 (43 days ago)
InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: plasma-workspace
UpgradeStatus: No upgrade log present (probably fresh install)

[Rik Mills (rikmills)]

It loads for me without error.

Output of:

apt-cache policy marble marble-data

would be handy.

[Pacific Seascape (seascape)]

As requested.

marble:
  Installed: 4:17.12.3-0ubuntu1
  Candidate: 4:17.12.3-0ubuntu1
  Version table:
 *** 4:17.12.3-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status
marble-data:
  Installed: 4:17.12.3-0ubuntu1
  Candidate: 4:17.12.3-0ubuntu1
  Version table:
 *** 4:17.12.3-0ubuntu1 500
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://us.archive.ubuntu.com/ubuntu bionic/universe i386 Packages
        100 /var/lib/dpkg/status

[Rik Mills (rikmills)]

Same versions I tested and found no issue. :/

[Zubin (zparihar)]

I have the exact same issue:

zubin@zubin-HP-Z420-Workstation:~$ apt-cache policy marble marble-data
marble:
  Installed: 4:17.12.3-0ubuntu1
  Candidate: 4:17.12.3-0ubuntu1
  Version table:
 *** 4:17.12.3-0ubuntu1 500
        500 http://ca.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        100 /var/lib/dpkg/status
marble-data:
  Installed: 4:17.12.3-0ubuntu1
  Candidate: 4:17.12.3-0ubuntu1
  Version table:
 *** 4:17.12.3-0ubuntu1 500
        500 http://ca.archive.ubuntu.com/ubuntu bionic/universe amd64 Packages
        500 http://ca.archive.ubuntu.com/ubuntu bionic/universe i386 Packages
        100 /var/lib/dpkg/status

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 18.04.3 LTS
Release: 18.04
Codename: bionic

$ dpkg -l | grep marble
ii libmarblewidget-qt5-28 4:17.12.3-0ubuntu1 amd64 Marble globe widget library
ii marble 4:17.12.3-0ubuntu1 amd64 globe and map widget
ii marble-data 4:17.12.3-0ubuntu1 all data files for Marble
ii marble-maps 4:17.12.3-0ubuntu1 amd64 globe and map widget for mobile form factors
ii marble-plugins 4:17.12.3-0ubuntu1 amd64 plugins for Marble
ii marble-qt 4:17.12.3-0ubuntu1 amd64 globe and map widget (no KDE dependencies)

Installed it, but have not logged out or logged back in yet...

[Zubin (zparihar)]

So I had Logged back out and then logged back in and then tried again to load the widget on the desktop, and now it is WORKING.

So something isn't dynamically loading for widgets?