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...
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https://bugs.launchpad.net/bugs/1796102
Title:
World clock plasmoid can't be launched in Kubuntu 18.04
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