I know this has been asked, but I believe my case is different. I've had windows 10 and ubuntu 16 dual booted on my laptop, and I just installed kali for a class, making triple boot. It will prompt me for user name and password but it will either get stuck on a grey background, or go to a black screen and then back to prompting me for the username password.
Some general solutions suggest to install lightdm and that will fix the problem, but I can't connect to wifi, and have no ethernet cable. ctrl + alt + f2 still pops up a terminal, but just about any command I run (and even when I'm not running anything) will get a watchdog error or something like "watchdog: bug: soft lockup - cpu#1 stuck for 22s!"
Any solution? My other operating systems still work just fine. I can give more details about the watchdog error (it's prints a lot of stuff).
Anything helps, I've been on this problem for a while now. If it makes a difference, when I made the bootable drive, I used rufus and told it to install as DD instead of ISO (since the ISO wouldn't mount the cdrom partition or something like that).
EDIT: Some people are hinting that the solution to this problem is to just install a different distro, since kali isn't for the laymen or whatever. I disagree. I learned a lot solving this issue and I urge you to try and tackle yours too. Thanks everybody.