не може встановити libpq-dev в ubuntu 14.04

Не можу встановити libpq-dev для postgresql, я спробував

sudo apt-get install libpq-dev

і вихід

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.

як виправити цю проблему?

Проблема вирішена!

Я вирішив це за допомогою видалення libpq5:

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

Проблему можна вирішити за допомогою наступних кроків:

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