I've Ubuntu 12.04 installed as my only OS on My Lenovo ThinkPad X1 Carbon. Today it wouldn't boot (the screen just went black when Ubuntu booted). I resat the BIOS to default and tried booting again - now 'ubuntu' disappeared from the boot list, and I'm not able to boot anything anymore. Is there any fix for this? It's a pretty bad situation..
Cheers, Adrian