The SIFT Workstation[1] is a well-known Linux distribution oriented to forensics and incident response tasks. It is used in many SANS training as the default platform. This is also my preferred solution for my day-to-day DFIR activities. The distribution is available as a virtual machine but you can install it on top of a classic Ubuntu system. Today, everything is virtualized and most DFIR activities can be performed remotely with the provided VM but... sometimes you still need a way to perform local investigations against a physical computer. That's why I always carry a USB stick with me. Before I was using Kali which provides a standard solution.