sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
You might want to run 'apt-get -f install' to correct these.
The following packages have unmet dependencies:
 libapache2-mod-php5 : Depends: apache2-api-20120211 but it is not installable
                       Depends: apache2 (>= 2.4)
                       Depends: php5-common (= 5.5.30+dfsg-1+deb.sury.org~precise+1) but 5.3.10-1ubuntu3.21 is installed
E: Unmet dependencies. Try using -f.