ubuntu 14.04 libpq-dev yükleyemiyor

Postgresql için libpq-dev yükleyemiyorum, denedim

sudo apt-get install libpq-dev

ve çıktı

Building dependency tree       
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
 libpq-dev : Depends: libpq5 (= 9.3.9-0ubuntu0.14.04) but 9.4.4-1.pgdg14.04+1 is to be installed
E: Unable to correct problems, you have held broken packages.

bu sorun nasıl çözülür?

Sorun çözüldü!

Bunu kaldır ile çözdüm libpq5:

sudo apt-get remove libpq5
sudo apt-get install libpq-dev

Sorun aşağıdaki adımlarla çözülebilir:

sudo apt-get update
sudo apt-get remove libpq5
sudo apt-get install libpq-dev