Installing and upgrading help

Sure, I will take that in notice, sounds right to me too.

Hi,

I upgraded ubuntu from 16.04 LTS to 18.04 LTS and after upgrade it shows me this page:
<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see .

/**
* Moodle frontpage.
*
* @package core
* @copyright 1999 onwards Martin Dougiamas (http://dougiamas.com)
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/

if (!file_exists('./config.php')) {
header('Location: install.php');
die;
}

require_once('config.php');
require_once($CFG->dirroot .'/course/lib.php');
require_once($CFG->libdir .'/filelib.php');

redirect_if_major_upgrade_required();

$urlparams = array();
if (!empty($CFG->defaulthomepage) && ($CFG->defaulthomepage == HOMEPAGE_MY) && optional_param('redirect', 1, PARAM_BOOL) === 0) {
$urlparams['redirect'] = 0;
}
$PAGE->set_url('/', $urlparams);
$PAGE->set_pagelayout('frontpage');
$PAGE->set_other_editing_capability('moodle/course:update');
$PAGE->set_other_editing_capability('moodle/course:manageactivities');
$PAGE->set_other_editing_capability('moodle/course:activityvisibility');

// Prevent caching of this page to stop confusion when changing page after making AJAX changes.
$PAGE->set_cacheable(false);

require_course_login($SITE);

$hasmaintenanceaccess = has_capability('moodle/site:maintenanceaccess', context_system::instance());

// If the site is currently under maintenance, then print a message.
if (!empty($CFG->maintenance_enabled) and !$hasmaintenanceaccess) {
print_maintenance_message();
}

$hassiteconfig = has_capability('moodle/site:config', context_system::instance());

if ($hassiteconfig && moodle_needs_upgrading()) {
redirect($CFG->wwwroot .'/'. $CFG->admin .'/index.php');
}

// If site registration needs updating, redirect.
\core\hub\registration::registration_reminder('/index.php');

if (get_home_page() != HOMEPAGE_SITE) {
// Redirect logged-in users to My Moodle overview if required.
$redirect = optional_param('redirect', 1, PARAM_BOOL);
if (optional_param('setdefaulthome', false, PARAM_BOOL)) {
set_user_preference('user_home_page_preference', HOMEPAGE_SITE);
} else if (!empty($CFG->defaulthomepage) && ($CFG->defaulthomepage == HOMEPAGE_MY) && $redirect === 1) {
redirect($CFG->wwwroot .'/my/');
} else if (!empty($CFG->defaulthomepage) && ($CFG->defaulthomepage == HOMEPAGE_USER)) {
$frontpagenode = $PAGE->settingsnav->find('frontpage', null);
if ($frontpagenode) {
$frontpagenode->add(
get_string('makethismyhome'),
new moodle_url('/', array('setdefaulthome' => true)),
navigation_node::TYPE_SETTING);
} else {
$frontpagenode = $PAGE->settingsnav->add(get_string('frontpagesettings'), null, navigation_node::TYPE_SETTING, null);
$frontpagenode->force_open();
$frontpagenode->add(get_string('makethismyhome'),
new moodle_url('/', array('setdefaulthome' => true)),
navigation_node::TYPE_SETTING);
}
}
}

// Trigger event.
course_view(context_course::instance(SITEID));

// If the hub plugin is installed then we let it take over the homepage here.
if (file_exists($CFG->dirroot.'/local/hub/lib.php') and get_config('local_hub', 'hubenabled')) {
require_once($CFG->dirroot.'/local/hub/lib.php');
$hub = new local_hub();
$continue = $hub->display_homepage();
// Function display_homepage() returns true if the hub home page is not displayed
// ...mostly when search form is not displayed for not logged users.
if (empty($continue)) {
exit;
}
}

$PAGE->set_pagetype('site-index');
$PAGE->set_docs_path('');
$editing = $PAGE->user_is_editing();
$PAGE->set_title($SITE->fullname);
$PAGE->set_heading($SITE->fullname);
$courserenderer = $PAGE->get_renderer('core', 'course');
echo $OUTPUT->header();

// Print Section or custom info.
$siteformatoptions = course_get_format($SITE)->get_format_options();
$modinfo = get_fast_modinfo($SITE);
$modnames = get_module_types_names();
$modnamesplural = get_module_types_names(true);
$modnamesused = $modinfo->get_used_module_names();
$mods = $modinfo->get_cms();

if (!empty($CFG->customfrontpageinclude)) {
include($CFG->customfrontpageinclude);

} else if ($siteformatoptions['numsections'] > 0) {
if ($editing) {
// Make sure section with number 1 exists.
course_create_sections_if_missing($SITE, 1);
// Re-request modinfo in case section was created.
$modinfo = get_fast_modinfo($SITE);
}
$section = $modinfo->get_section_info(1);
if (($section && (!empty($modinfo->sections[1]) or !empty($section->summary))) or $editing) {
echo $OUTPUT->box_start('generalbox sitetopic');

// If currently moving a file then show the current clipboard.
if (ismoving($SITE->id)) {
$stractivityclipboard = strip_tags(get_string('activityclipboard', '', $USER->activitycopyname));
echo '

';
echo "$stractivityclipboard  (";
echo get_string('cancel') . ')';
echo '

';
}

$context = context_course::instance(SITEID);

// If the section name is set we show it.
if (trim($section->name) !== '') {
echo $OUTPUT->heading(
format_string($section->name, true, array('context' => $context)),
2,
'sectionname'
);
}

$summarytext = file_rewrite_pluginfile_urls($section->summary,
'pluginfile.php',
$context->id,
'course',
'section',
$section->id);
$summaryformatoptions = new stdClass();
$summaryformatoptions->noclean = true;
$summaryformatoptions->overflowdiv = true;

echo format_text($summarytext, $section->summaryformat, $summaryformatoptions);

if ($editing && has_capability('moodle/course:update', $context)) {
$streditsummary = get_string('editsummary');
echo " " href=\"course/editsection.php?id=$section->id\">" . $OUTPUT->pix_icon('t/edit', $streditsummary) .
"

";
}

$courserenderer = $PAGE->get_renderer('core', 'course');
echo $courserenderer->course_section_cm_list($SITE, $section);

echo $courserenderer->course_section_add_cm_control($SITE, $section->section);
echo $OUTPUT->box_end();
}
}
// Include course AJAX.
include_course_ajax($SITE, $modnamesused);

if (isloggedin() and !isguestuser() and isset($CFG->frontpageloggedin)) {
$frontpagelayout = $CFG->frontpageloggedin;
} else {
$frontpagelayout = $CFG->frontpage;
}

foreach (explode(',', $frontpagelayout) as $v) {
switch ($v) {
// Display the main part of the front page.
case FRONTPAGENEWS:
if ($SITE->newsitems) {
// Print forums only when needed.
require_once($CFG->dirroot .'/mod/forum/lib.php');

if (! $newsforum = forum_get_course_forum($SITE->id, 'news')) {
print_error('cannotfindorcreateforum', 'forum');
}

// Fetch news forum context for proper filtering to happen.
$newsforumcm = get_coursemodule_from_instance('forum', $newsforum->id, $SITE->id, false, MUST_EXIST);
$newsforumcontext = context_module::instance($newsforumcm->id, MUST_EXIST);

$forumname = format_string($newsforum->name, true, array('context' => $newsforumcontext));
echo html_writer::link('#skipsitenews',
get_string('skipa', 'access', core_text::strtolower(strip_tags($forumname))),
array('class' => 'skip-block skip'));

// Wraps site news forum in div container.
echo html_writer::start_tag('div', array('id' => 'site-news-forum'));

if (isloggedin()) {
$SESSION->fromdiscussion = $CFG->wwwroot;
$subtext = '';
if (\mod_forum\subscriptions::is_subscribed($USER->id, $newsforum)) {
if (!\mod_forum\subscriptions::is_forcesubscribed($newsforum)) {
$subtext = get_string('unsubscribe', 'forum');
}
} else {
$subtext = get_string('subscribe', 'forum');
}
echo $OUTPUT->heading($forumname);
$suburl = new moodle_url('/mod/forum/subscribe.php', array('id' => $newsforum->id, 'sesskey' => sesskey()));
echo html_writer::tag('div', html_writer::link($suburl, $subtext), array('class' => 'subscribelink'));
} else {
echo $OUTPUT->heading($forumname);
}

forum_print_latest_discussions($SITE, $newsforum, $SITE->newsitems, 'plain', 'p.modified DESC');

// End site news forum div container.
echo html_writer::end_tag('div');

echo html_writer::tag('span', '', array('class' => 'skip-block-to', 'id' => 'skipsitenews'));
}
break;

case FRONTPAGEENROLLEDCOURSELIST:
$mycourseshtml = $courserenderer->frontpage_my_courses();
if (!empty($mycourseshtml)) {
echo html_writer::link('#skipmycourses',
get_string('skipa', 'access', core_text::strtolower(get_string('mycourses'))),
array('class' => 'skip skip-block'));

// Wrap frontpage course list in div container.
echo html_writer::start_tag('div', array('id' => 'frontpage-course-list'));

echo $OUTPUT->heading(get_string('mycourses'));
echo $mycourseshtml;

// End frontpage course list div container.
echo html_writer::end_tag('div');

echo html_writer::tag('span', '', array('class' => 'skip-block-to', 'id' => 'skipmycourses'));
break;
}
// No "break" here. If there are no enrolled courses - continue to 'Available courses'.

case FRONTPAGEALLCOURSELIST:
$availablecourseshtml = $courserenderer->frontpage_available_courses();
if (!empty($availablecourseshtml)) {
echo html_writer::link('#skipavailablecourses',
get_string('skipa', 'access', core_text::strtolower(get_string('availablecourses'))),
array('class' => 'skip skip-block'));

// Wrap frontpage course list in div container.
echo html_writer::start_tag('div', array('id' => 'frontpage-course-list'));

echo $OUTPUT->heading(get_string('availablecourses'));
echo $availablecourseshtml;

// End frontpage course list div container.
echo html_writer::end_tag('div');

echo html_writer::tag('span', '', array('class' => 'skip-block-to', 'id' => 'skipavailablecourses'));
}
break;

case FRONTPAGECATEGORYNAMES:
echo html_writer::link('#skipcategories',
get_string('skipa', 'access', core_text::strtolower(get_string('categories'))),
array('class' => 'skip skip-block'));

// Wrap frontpage category names in div container.
echo html_writer::start_tag('div', array('id' => 'frontpage-category-names'));

echo $OUTPUT->heading(get_string('categories'));
echo $courserenderer->frontpage_categories_list();

// End frontpage category names div container.
echo html_writer::end_tag('div');

echo html_writer::tag('span', '', array('class' => 'skip-block-to', 'id' => 'skipcategories'));
break;

case FRONTPAGECATEGORYCOMBO:
echo html_writer::link('#skipcourses',
get_string('skipa', 'access', core_text::strtolower(get_string('courses'))),
array('class' => 'skip skip-block'));

// Wrap frontpage category combo in div container.
echo html_writer::start_tag('div', array('id' => 'frontpage-category-combo'));

echo $OUTPUT->heading(get_string('courses'));
echo $courserenderer->frontpage_combo_list();

// End frontpage category combo div container.
echo html_writer::end_tag('div');

echo html_writer::tag('span', '', array('class' => 'skip-block-to', 'id' => 'skipcourses'));
break;

case FRONTPAGECOURSESEARCH:
echo $OUTPUT->box($courserenderer->course_search_form('', 'short'), 'mdl-align');
break;

}
echo '
';
}
if ($editing && has_capability('moodle/course:create', context_system::instance())) {
echo $courserenderer->add_new_course_button();
}
echo $OUTPUT->footer();

Is there any configuration I have to do? Please advise

Thanks