In Linux mint 19 xfce, I try to install: master-pdf-editor-5.1.12_qt5.amd64.deb.

I try to install this package with: Gdebi-gtk.
I get a description of the packet, with a tab to "install" it.

The result is: Er is een onhandelbare fout opgetreden
Het lijkt er op dat er een fout in het programma aptdaemon aanwezig is, het programma waarmee u software kunt installeren/verwijderen en andere pakket-gerelateerde taken kunt uitvoeren.
In English: Unhandled error occurred
There seems to be a programming error in aptdaemon, the software that allows you to install/remove software and to perform other package management related tasks.

Details: org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

How to solve this problem ??

Martin