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Workaround: login as root and perform admin-like tasks, which are most tasks in this course without the use of 'sudo'

Description: in most of the SG exercises solution steps the student has to use 'sudo' to perform tasks with elevated privileges.
in exercise chapter 14, page 340 mounting and unmouting a student lost 1 hour of his life because, logged in as 'student 'sudo mount -a' did not work, whereas student logged in as 'root., doing 'mount -a' passed this point unhinderend.