Не удается установить php5-apc из источника dotdeb в Debian 6

Я не могу установить php5-apc:

~# apt-get install php5-apc
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:
 php5-apc : Depends: php5-common (= 5.3.19-1~dotdeb.0) but 5.3.8-2 is to be installed
E: Broken packages

Иметь свежий Debian 6 и

deb http://packages.dotdeb.org squeeze all
deb-src http://packages.dotdeb.org squeeze all

в source.list.

PS Я не очень опытный - просто пытаюсь настроить сервер с помощью учебника.