$ sudo apt-get update
$ sudo apt-get install qtdeclarative5-dialogs-plugin 

qtdeclarative5-dialogs-plugin is installed in your system.

Make ensure the qtdeclarative5-dialogs-plugin package were installed using the commands given below,

$ sudo dpkg-query -l | grep qtdeclarative5-dialogs-plugin *

You will get with qtdeclarative5-dialogs-plugin package name, version, architecture and description in a table

qtdeclarative5-dialogs-plugin package basic information: