The following packages have unmet dependencies:
  php5-fpm : Depends: php5-common (= 5.5.7+dfsg-1+sury.org~quantal+1) but 5.3.10-1ubuntu3 is to be installed
 E: Unable to correct problems, you have held broken packages.

root@myserv /home/pw # sudo apt-get install php5-common
Reading package lists... Done
Building dependency tree
Reading state information... Done
php5-common is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 43 not upgraded.

root@myserv /home/pw # sudo apt-get install php5-fpm --fix-missing --fix-broken
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-fpm : Depends: php5-common (= 5.5.7+dfsg-1+sury.org~quantal+1) but 5.3.10-1ubuntu3 is to be installed
E: Unable to correct problems, you have held broken packages.

sudo aptitude install php5-fpm

sudo apt-get install aptitude