Travis: revert part of last commits to restore testing on trusty

.travis.yml

@@ -3,9 +3,9 @@ language: php
 addons:
     apt:
         packages:
-        #- apache2
+        - apache2
         - postfix
-        #- libapache2-mod-fastcgi
+        - libapache2-mod-fastcgi
         - libappindicator1
         - fonts-liberation
     chrome: stable
@@ -14,7 +14,7 @@ services:
     - mysql
 
 sudo: required
-dist: xenial
+dist: trusty
 cache:
   directories:
     - $HOME/.composer/cache/files
@@ -33,8 +33,8 @@ env:
     - CHAMILO_VERSION=1.11.x
 
 before_install:
-  - sudo apt-get update
-  - sudo apt-get install apache2 libapache2-mod-fastcgi
+  #- sudo apt-get update
+  #- sudo apt-get install apache2 libapache2-mod-fastcgi
   # Fix travis error https://github.com/travis-ci/travis-ci/issues/8607
   - sudo rm -vf /etc/apt/sources.list.d/*riak*
   # Get Chrome