In order to allow a simplified update of Moodle, its installation was done using Git. To update Moodle, perform the following operations, using the command line.
Log into the MoodleBox via SSH, with the usual password Moodlebox4$.
Update to a minor version
To update to the next minor version of Moodle (3.4.1, 3.4.2, etc.), type the following commands in the terminal:
cd /var/www/moodle/ sudo -u www-data git pull
Update to a major version
To update to the next major version of Moodle (3.5, 3.6, etc.), type the additional following commands:
sudo -u www-data git config remote.origin.fetch "+refs/heads/*:refs/remotes/origin/*" sudo -u www-data git fetch origin sudo -u www-data git pull sudo -u www-data git checkout MOODLE_35_STABLE
Then visit the URL http://moodlebox.home/admin and follow the update instructions, just like above.