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# Fixes you need after upgrading Ubuntu to 16.04 from 14.04
[TOC]
## Postfix
```
postconf -e daemon_directory='/usr/lib/postfix/sbin
postconf -e shlib_directory='/usr/lib/postfix'
```
* Incorrect `daemon_directory` causes Postfix cannot start.
* Incorrect `shlib_directory` causes Postfix cannot find pcre/mysql/pgsql/ldap modules.
## PHP [OPTIONAL]
> NOTE: This step is toally optional if you're fine with old PHP release.
php was not upgraded to 7.0 automatically, have to install them manually:
```
apt-get install php-json php-gd php-mcrypt php-curl mcrypt php-intl php-xml php-mbstring php-mysql libapache2-mod-php
```