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

qtdeclarative5-accounts-plugin is installed in your system.

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

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

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

qtdeclarative5-accounts-plugin package basic information: