When I execute the command
sudo apt-get install php5-phalcon I just get this error (I used Google translate, but you'll get the idea):
Failed to install some packages. This may mean that requested an impossible situation or if you are using the distribution distribution that some required packages have not yet been created or been been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: php5-Phalcon: Depends: 20121212 + lfs-phpapi Recommends: php-apc or php5-xcache but it will not be installed E: We were unable to correct problems, you have held broken packages.
I never had this issue before. PHP is 5.6 (but also with 5.5).