Kali Linux 2019.4 is now available and it’s a major update to the very popular ethical hacking and penetration testing operating system due to its massive look and feel changes. This is the first Kali Linux release to switch to the lightweight Xfce desktop environment by default, and also implement a brand-new desktop theme for both Xfce and GNOME desktops. Apart from the new look and feel, the Kali Linux 2019.4 release introduces “Kali Undercover” mode, which is actually a theme made to transform your Xfce desktop environment into a Windows look-a-like desktop for those who are hacking in public places and don’t want people to say they are using a Linux distro, but a Windows operating system.