$ sudo apt-get update
$ sudo apt-get install libkonqsidebarplugin4a 

libkonqsidebarplugin4a is installed in your system.

Make ensure the libkonqsidebarplugin4a package were installed using the commands given below,

$ sudo dpkg-query -l | grep libkonqsidebarplugin4a *

You will get with libkonqsidebarplugin4a package name, version, architecture and description in a table

libkonqsidebarplugin4a package basic information: