I am running Kali Linux, Linux Mint, and Ubuntu. I was testing out a bootable usb drive that I had tried to make of puppy linux, and it did not work. So, I restarted my computer and went to boot Kali, which is my main, but I was greeted by a black screen. I waited for ten or so minutes, just to be sure, and when nothing was happening I rebooted again. This time, I booted into Mint. Everything worked fine, so I rebooted again and booted into Kali recovery mode. This works as well. Because of this, I think it is a driver issue, but I am not sure. I even tried to update the video drivers through recovery mode, but I got errors trying to install packages saying that I didn't have enough space. I am sure that this is not true though, because Kali has used 250 gigs of space on a 500 gig partition. Is it a viable option to just backup all of by data, remove Kali and start again? This would not be my first choice if any one here can come up with a better solution, but I am willing to try anything.
Secondary Question (for those familiar with Kali):
If I were to copy all of my Kali data, would I need to copy everything in
/ to maintain all my personalized settings, or can I just copy the contents of
/root, /usr, and /etc?