apt-get и php5 на Ubuntu-невозможно установить причина зависимостей

Я пытаюсь запустить

sudo apt-get install php5

и получаем эту ошибку

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 : Depends: libapache2-mod-php5 (>= 5.4.17-1~dotdeb.1) but it is not going to be installed or
             libapache2-mod-php5filter (>= 5.4.17-1~dotdeb.1) but it is not going to be installed or
             php5-cgi (>= 5.4.17-1~dotdeb.1) but it is not going to be installed or
             php5-fpm (>= 5.4.17-1~dotdeb.1) but it is not going to be installed
    Depends: php5-common (>= 5.4.17-1~dotdeb.1) but it is not going to be installed
E: Broken packages

есть идеи, как сделать эту работу?