A few possible things to try (some of these have already been suggested, but for completeness are included):
- Check your BIOS settings that your chosen hard drive is still the boot device
- Boot to a Ubuntu Live CD (instead of installing Ubuntu, click the "Try Ubuntu" option instead
- In the Live "Try Ubuntu" mode, check the boot drive by running "Disks" and check it is marked as bootable
- Check grub installation and settings (maybe someone can add some hints here)
- Try the install again and pay careful and particular care around the last option of where to install grub, my guess is that is where your problem is. The system is unbootable because it doesn't know where to look*
*If you try the reinstall method, be careful where you install grub. Make sure it is your local hard drive, and not the USB key, or a partition of the harddrive. I typically (and think the best practice may be to) install it to the primary boot device and not in any particular partition. For me with a USB key in the computer this is usually /dev/sdb
since sda
will be the usb key (although it could be reversed (maybe)
as an aside, I find installing anything much easier if you remove all the hard drives and leave only the hard drive you are going to install onto. This:
- removes the chances of error (wiping the wrong drive for example)
- leaves you with only one real place to install grub (and it's not the key)
Once you do a clean boot, you can shut down and reinstall any extra/data drives