Got root.txt after lots of hours. The privesc part was something new for me, what a hard learning class. As others, I love and hate this box at the same time, thanks to the makers.
Tip for the privesc: Don’t expect to find the exact solution in exploiting_capabilities_the_dark_side.pdf. Take it only as an introduction to capabilities. The solution is easier than that, think and search a bit on the box.