Apt-get не находит пакет `git` на Ubuntu 12.04

Я пытаюсь установить git на ubuntu 12.04. Но при вводе команды

sudo apt-get install git

Я получаю следующее сообщение. Я уже выполнил sudo apt-get update.

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

Ответ 1