while running sudo apt-get upgrade, I stumbled this problem:

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:
 php5.6-fpm : Depends: php5.6-common (= 5.6.26-2+deb.sury.org~precise+1) but 5.6.28-1+deb.sury.org~precise+1 is installed
E: Unmet dependencies. Try using -f.

then after I do the suggestion by running sudo apt-get -f install, the new error message shows:

dpkg: dependency problems prevent configuration of php5.6-fpm:
 php5.6-fpm depends on php5.6-common (= 5.6.26-2+deb.sury.org~precise+1); however:
  Version of php5.6-common on system is 5.6.28-1+deb.sury.org~precise+1.
dpkg: error processing php5.6-fpm (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Errors were encountered while processing:
E: Sub-process /usr/bin/dpkg returned an error code (1)

I could not remove php5.6-fpm either because it also return Sub-process /usr/bin/dpkg returned an error code (1)

It seems the php5.6-fpm has different dependencies but cannot upgraded or removed because there is a configuration missing


A way to meet all required dependencies, is to install the lamp package by running the command below (including the ^ symbol)

sudo apt-get install lamp-server^

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