Ubuntu 9.10 server edition was installed on a Dell PowerEdge R805 box as part of expanding our malware analysis labs. The actual install itself was nice and easy, just like I’ve come to expect out of the Ubuntu folks. After finishing, I took my CD out, rebootedand suddenly found myself at a Busybox shell with a note about GRUB being unable to find the root of the hard drive. A quick bit of Googling seemed to suggest that there were issues with GRUB recognizing really big disks. Another 30-minute installation later, I rebooted, figuring I’d be all set.”]
Source: https://blog.talosintelligence.com/2010/04/wtf-ubuntu.html