[Bug 1770782] [NEW] Can't launch KDE partitionmanager after installing it on ubuntu 18.04

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Fresh install of ubuntu 18.04, enable sources and proposed, then install
partitionmanager.

When launching it from gnome "Activities", displays this error:

No administrative privileges - KDE Partition Manager
It is possible to run KDE Partition Manager without these privileges. You will, however, not be allowed to apply operations.
Do you want to continue running KDE Partition Manager?
Note: if administrator login is disabled and your password is not accepted, then check kdesu configuration.

** Affects: partitionmanager (Ubuntu)
     Importance: Undecided
         Status: New

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Can't launch KDE partitionmanager after installing it on ubuntu 18.04
https://bugs.launchpad.net/bugs/1770782
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