Ubuntu server 14.04
I have a Dell Precision T7400 with onboard SAS controller. After installing Ubuntu from LinuxLive USB USB drive, the machine freezes at the boot screen. I don't get any splash screens; this is happening well before that. There is no drive activity at all.
The weird thing is that if I leave the USB key in the USB port, it all boots up fine, and I get to my Ubuntu prompt with no problems. The BIOS boot order is the USB first and the local drive second. I have not configured any RAID with the SAS controller.
I had Oracle Enterprise Linux installed (6.4) and it works no problem.