Пакет emacs-snapshot-nox не встретил зависимости

Я пытаюсь установить emacs24 для внешнего репозитория, но я получаю ошибку относительно невстреченных зависимостей и задаюсь вопросом, как я могу продолжить установку и разрешить эту ошибку?

Вывод похож на это:

dito@dito:~$ sudo apt-get install emacs-snapshot-nox
Reading package lists... Done
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:
  emacs-snapshot-nox: Depends: emacs-snapshot-bin-common (= 1:20111012-1+squeeze1) but it is not going to be installed
                      Depends: libncurses5 (>= 5.7+20100313) but 5.7+20090803-2ubuntu3 is to be installed
                      PreDepends: dpkg (>= 1.15.6) but 1.15.5.6ubuntu4.5 is to be installed
E: Broken packages
dito@dito:~$