I'm using Ubuntu 14.04 on iMac 27 in dual boot with OSX via rEFInd.
It works nice but when I click to shutdown the Ubuntu it is so quickly and the screen becomes black in 1 or 2 seconds.
So I can not read any messages during the process (for example, on my laptop Sony I can read some process being killed).
My question: is the shutdown being normal or some forced process could corrupt something?
Does anybody have the same fast shutdown?