$ apt-get install --reinstall php5
Reading package lists... Done
Building dependency tree
Reading state information... Done
0 upgraded, 0 newly installed, 1 reinstalled, 0 to remove and 113 not upgraded.
3 not fully installed or removed.
After this operation, 0 B of additional disk space will be used.
Setting up libapache2-mod-php5 (5.3.6-13ubuntu3.2) ...
Error: The new file /usr/share/php5/php.ini-production does not exist!
dpkg: error processing libapache2-mod-php5 (--configure):
 subprocess installed post-installation script returned error exit status 1
dpkg: dependency problems prevent configuration of php5:
 php5 depends on libapache2-mod-php5 (>= 5.3.6-13ubuntu3.2) | libapache2-mod-php5filter (>= 5.3.6-13ubuntu3.2) | php5-cgi (>= 5.3.6-13ubuntu3.2) | php5-fpm (>= 5.3.6-13ubuntu3.2); however:
  Package libapache2-mod-php5 is not configured yet.
  Package libapache2-mod-php5filter is not installed.
  Package php5-cgi is not installed.
  Package php5-fpm is not installed.
dpkg: error processing php5 (--configure):
 dependency problems - leaving unconfigured
No apport report written because the error message indicates its a followup error from a previous failure.
                                                                                                          Setting up php5-cli (5.3.6-13ubuntu3.2) ...

Creating config file /etc/php5/cli/php.ini with new version
update-alternatives: using /usr/bin/php5 to provide /usr/bin/php (php) in auto mode.
Errors were encountered while processing:
 libapache2-mod-php5
 php5
E: Sub-process /usr/bin/dpkg returned an error code (1)