Comment 4 for bug 1091986

Additional info: I was able to boot into "recovery mode" and diagnose the system from there. However, trying to run normal boot resulted in kernel crash every time (I booted about 30 times while trying to fix the system). The crash occured usually before the purple "Ubuntu" boot screen was visible but one the system crashed in the lightdm greeter and I was able to move the mouse cursor and move focus to password input before the crash. I guess that the exact moment of the crash was depending on what ulatencyd was doing during startup and during that boot, ulatencyd was running slightly later than usual.

The system is installed on Intel 320 series SSD so the actual boot is pretty fast. My monitor is quite slow to display the image after resolution change so I'm not sure what the system was trying to display the moment the crashes occurred.