There's no way to solve the mod_authz_default.so inside Apache.

Apache error occurs after Unbuntu performs php5.3 upgrade to 5.5

Output of config test was:
Apache2:syntax Error on line of/etc/apache2/apache2.conf:syntax error on line 1 of/etc/apache2/mods-enabled/authz_ Default.load:Cannot load/usr/lib/apache2/modules/mod_authz_default.so into server:/usr/lib/apache2/modules/mod_ Authz_default.so:cannot open Shared object file:no such file or directory
Action ' Configtest ' failed.
The Apache error log may has more information.

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Apache error occurs after Unbuntu performs php5.3 upgrade to 5.5

Output of config test was:
Apache2:syntax Error on line of/etc/apache2/apache2.conf:syntax error on line 1 of/etc/apache2/mods-enabled/authz_ Default.load:Cannot load/usr/lib/apache2/modules/mod_authz_default.so into server:/usr/lib/apache2/modules/mod_ Authz_default.so:cannot open Shared object file:no such file or directory
Action ' Configtest ' failed.
The Apache error log may has more information.

This is not related to PHP, is Apache 2.4, this module was removed, if you do not need, you can delete the corresponding line in the file
Including these three modules, mod_authz_default mod_authn_defaultmod_mem_cache

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