Installed Ubuntu 11.10 64-bit on X79-UD5 motherboard (8x4Gb Ram, on 120Gb SSD) with GTX580 gfx card. Had to do nomodeset, otherwise the installer would hang during intialisation or not load at all. After completing the installation, Ubuntu restarts and loads grub menu. Either selection in the grub causes the system to immediately restart and goes back to grub.
Any idea what's causing this issue?