After a day of restarting my computer i finally given up. I had Ubuntu 18.10 installed and worked perfectly and then i got the upgrade prompt and upgraded to 19.04. The upgrade crashed and after that the system was still booting except 80% of the time. Most of the boots resulted in a purple screen and that is all. I tried everything on the web and nothing seams to work. It is very very random. Couldn't find a way to see where it hangs. The frozen boots fo not appear in the journal. If i try to boot the recovery both messages appear so loads the kernel and the other thing and then it hangs. I reinstalled Ubuntu 18.10 (with updates) and had the same problem. I did the upgrade (which this time worked) to 19.04 and same problem. Now I installed Ubuntu 18.04.2 without any updates and i got it working 4/4 boots. I did the updates 400ish mb of updates and then started doing the same thing with the purple screen. I reinstalled the 18.04.2 and didn't do the updates.
I have no other options than to hope.. I have a Zenbook UX433FA and dualboot with Windows. I guess it is one of the packages that gets updated on 18.04.2 but i don't know which one.
edit: before the 18.10 reinstall i did a fresh reinstall of 19.04