Linux is a Unix-like and POSIX-compliant computer operating system assembled under the model of free and open source software development and distribution. The defining component of Linux is the Linux kernel, an operating system kernel first released on 5 October 1991 by Linus Torvalds.
If you installed Kali offline from a CD/DVD or USB (or have chosen not to connect to internet during installation), you probably have an empty sources.list file with just 2 …