I have tried to install the dbg file for Dolphin via Synaptic but the version available is not the same as the version of Dolphin I have installed.
The version I have installed is 4:16.04.3-0ubuntu2.1~ubuntu16.04~ppa1 and the version available is 4:15.12.3~0ubuntu1
How and where do I download/install the dbg for my version of Dolphin?

Any help appreciated.

Heck, is there no-one here who has any idea?
Hardly any questions are answered, yet most have hundreds of views.
Is this forum where people come to only ask a question and it's a lottery as to whether it gets answered!

You are asking distribution specific question on the KDE community forums.

You probably get faster support from the (K)ubuntu support forums.
Kubuntu.org: https://kubuntu.org -> Help and Support: https://kubuntu.org/support/

Sorry if this sounds a dumb question, but, what's this forum for?