I have just completed a fresh installed of Kubuntu 18.04 which contains
Plasma version 5.12.6. The problem is still present.
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Bugs, which is subscribed to solid in Ubuntu.
https://bugs.launchpad.net/bugs/1762163
Title:
As of 19/11/2015 this seems to have been fixed by recent updates.
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https://bugs.launchpad.net/bugs/1515746
Title:
kde panel widgets not working
To manage
Public bug reported:
lsb_release -rd
Description:Ubuntu 15.04
Release:15.04
apt-cache policy kdebase
kdebase:
Installed: (none)
Candidate: (none)
Version table:
Qt: 4.8.6
KDE Development Platform: 4.14.6
KDE Daemon: 4.14.6
Linux Linux8 3.19.0-22-generic #22-Ubuntu SMP Tue Jun