I have installed ubuntu 12.04 on my Thinkpad Edge (UEFI) using an USB-Stick. I guess it has been botted using EFI since a GRUB menu appeared with the options to boot a live system, install, or check the disk.
When I boot my laptop, grub only shows its command line prompt "grub>".
After manually running
grub-install /dev/sda +
update-grub within a chrooted environment it boots grub in recovery mode saying "File not found."
The disk is partitioned as follows:
/dev/sda1: ntfs, 1.5GB, SYSTEM DRV /dev/sda2: ntfs, 150GB, Windows7 OS /dev/sda3: extended /dev/sda6: ext4, 140GB, Ubuntu 12.04 /dev/sda5: ntfs, 10.7GB, Lenovo Recovery /dev/sda4: ntfs, 16.8GB, a custom additional partition
I guessed that the partition labelled "SYSTEM DRV" may be the EFI partition, but then I read that the EFI partition is of type FAT32. I don't have any FAT32 partition here!
So I can't follow any How-Tos explaining how to install Grub2 with EFI support. They all want me to mount my EFI partition at /boot/efi. I also can't just create an EFI partition since in most How-Tos they say that it should be the first partition (at least it has to be a primary partition), but as you see I already have a partition 1.
Isn't it possible to just use the normal Grub2 tool on EFI hardware?
If not, will creating an EFI partition solve the problem? Can I use partition 4 for that?
My BootInfo as created by using this article can be found here: http://paste.ubuntu.com/1011739/. Note that is being made from a Ubuntu Live USB drive which was at
/dev/sdb, so you should ignore this drive.
As EFI doesn't seem to be the problem here, I reinstalled (non-EFI-)grub using
New BootInfo can be found here: http://paste.ubuntu.com/1012223/.
Problem is now, that BIOS doesn't boot but gives the error:
Operating system not found.
UPDATE 2 (SOLUTION):
When you read this question when having the same issue (Operating system not found.), you might miss the forest for the trees when reading the answers, so I repeat the solution here:
The problem in my case was, that I accidently changed the boot flag of the drive to
/dev/sda6, which is a logical partition. BIOS searches for boot flags on a hard drive it wants to boot from, but only looks in primary partitions. If it can't find a boot flag, it skips the hard drive. If it doesn't find any drive or media to boot from, you see the error "Operating system not found."