UbuntuCLI: Postfix - only install if required (as a dependence)

UbuntuCLI/packages_install.sh

@@ -23,9 +23,10 @@ touch ~/.bashrc # some install scripts want to append stuff here
 # Preconfigure Postfix to select "Local only" and set the address to localhost
 # TODO find out which packages have postfix as a dependency ant maybe try to remove
 # the dependency in the future?
+# TODO check - only adding the answers to debconf so that the installation is
+# not interrupted if a package has postfix as its dependence.
 echo "postfix postfix/mailname string localhost" | sudo debconf-set-selections
 echo "postfix postfix/main_mailer_type select Local only" | sudo debconf-set-selections
-sudo apt-get install -y postfix
 
 # sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test # repository with latest GCC
 LATEST_GCC_VER_IN_APT=$(apt-cache search --names-only '^gcc-[0-9][0-9]$' \