Apt-get ne trouve pas le paquet `git` sur Ubuntu 12.04

Je suis en train d'installer git sur ubuntu 12.04. Mais lorsque vous entrez dans la commande

sudo apt-get install git

Je reçois le message suivant. J'ai couru sudo apt-get update déjà.

Reading package lists... Done
Building dependency tree       
Reading state information... Done
Package git is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
However the following packages replace it:
  git-el

E: Package 'git' has no installation candidate

source d'informationauteur Shahzeb | 2013-04-23