Synaptic installing error
 

I have a Synaptic error that reads every time I install a package.
error reads:

"debconf: unable to initialize frontend: Dialog
(Dialog frontend will not work on dump terminal , an emac shell buffer, or without a controlling terminal
deconf: falling back to frontend: Readline
Selecting previously deselected package ****"

Then it goes on to reading database and installing package.
I get this with or without Dialog installed.
How I fix it?

Yeah, I get that too. It's just a warning telling you that synaptic's simple shell display is unable to use the dialog program that some packages call up when they have user-configurable options, and that it will instead use a fall-back line display. I don't know if it's fixable, but it doesn't affect any of the vital installation functions.