kali linux 2016.2 64bit
Asus K550L
i7 4510U geforce 820m
8gb ram 1TB HDD
Qualcomm Atheros AR956x Wireless Adapter
using a 32gb live usb with persistence

So first thing I tried is following the offiicial tutorial. However, that didn't work since after the first 4 commands and then rebooting I get this error:
"Oops, something went wrong and the system couldn't recover" in a white box and said try to reboot to fix it and I tried so but still didn't work, in which case I correctly formatted my usb and install the os and everything and try it again, but same error, so then I tried another tutorial but also gave me the same error, there was one tutorial that was different (But i cant show the video..smh), after following it and rebooting, the system wouldnt boot and i got this:

I don't WANT nvidia's drivers I just NEED to use my gpu (Cuda Cores) for crunching, didn't find any way else on how to do that tho and I keep failing trying this.