Sometimes you can get a error like this:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LANGUAGE = (unset),
LC_ALL = (unset),
LC_PAPER = “pt_BR.UTF-8”,
LC_ADDRESS = “pt_BR.UTF-8”,
LC_MONETARY = “pt_BR.UTF-8”,
LC_NUMERIC = “pt_BR.UTF-8”,
LC_TELEPHONE = “pt_BR.UTF-8”,
LC_IDENTIFICATION = “pt_BR.UTF-8”,
LC_MEASUREMENT = “pt_BR.UTF-8”,
LC_TIME = “pt_BR.UTF-8”,
LC_NAME = “pt_BR.UTF-8”,
LANG = “en_US.UTF-8”
are supported and installed on your system.
perl: warning: Falling back to the standard locale (“C”).
Press continue reading to understand how to fix this!
With the mpm-itk that is a multi-processing module (MPM) you can run each virtualhost with it’s own user id and group id. This is basically used to make a shared hosting secured, since you don’t have to make all virtualhosts folders readeable by apache user.
mpm-itk is based on the traditional prefork MPM, which means it’s non-threaded; in short, this means you can run non-thread-aware code (like many PHP extensions) without problems.

To change timezone in ubuntu, just use that in terminal:
sudo dpkg-reconfigure tzdata