I installed Ubuntu 16.04 on my HP Pavilion dm4 laptop the other day and everything was working fine until yesterday. I started up my laptop, but for some reason, at the login screen, I didn't see my wallpaper so I immediately knew something was wrong. When I login, it flashes the "System program problem detected" in the top right corner while the rest of the screen is black. I believe this is the same problem described in this thread, but no solution is working for my laptop.
Hopefully someone will reply to me soon, I have homework I need to complete...
Thank You in advance