What is /dev/null in Linux

The ‘/dev‘ directory in Linux and Unix based systems contains files corresponding to devices attached to the system. For example, as seen in the screenshot below, the CD drive is accessed using ‘cdrom‘, DVD drive

How to Enable “Universe” Repository in Ubuntu

‘Universe‘ is one of the standard repositories in Ubuntu, which contains community maintained free and open-source software, as opposed to ‘Main‘, which contains free and open-source software maintained by Ubuntu’s parent company Canonical. When Ubuntu