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Distribution: Ubuntu 14.04, Windows 8, Windows Server 2012. Ubuntu Server 14.04
Not the answer your looking for...
Ubuntu doesn't automatically make restore points so if you did not do a backup before upgrading there's no way to rollback...The other half of the question is for driver savy folks...Not me. Good Luck!
When you say OS 12.04, are you talking about Ubuntu? How far into the boot process does it get? Can you chroot into the installation? (to check on the contents of fstab, and see if your root partition is somehow misidentified?) Is your root partition a whole disk, or a partition on a disk? We need more information to help.