classes:  lecturer. The Linux operating system practice section requires a powerful computer configuration to run 4 virtual machines at the same time, due to the requirements of the practice subject.  curriculum. The Linux operating system practice section requires a powerful computer configuration to run 4 virtual machines at the same time, due to the requirements of the practice subject.  facility. The Linux operating system practice section requires a powerful computer configuration to run 4 virtual machines at the same time, due to the requirements of the practice subject.  general. The Linux operating system practice section requires a powerful computer configuration to run 4 virtual machines at the same time, due to the requirements of the practice subject.