Restore Ubuntu UEFI Boot Entries after BIOS Update

The Ubuntu installer will create an UEFI boot entry in BIOS during the installation of Ubuntu 12.04 LTS. When updating the BIOS these boot entries will be lost and Ubuntu will no longer boot afterwards.

Recovering UEFI Boot Entries for Ubuntu

Do the following steps to recover the boot entries:

Start the server using an Ubuntu installation CD or USB stick in UEFI mode:

Select the Rescue a broken system option.

Select the desired language and other settings.

Select the '' root partition'' for the system, select that device directly (clients in student pool /dev/sda3).

Select the '' Execute a shell in …'' option and then Continue.

Execute efibootmgr in order to display the current entries in the UEFI-firmware.

Mount the EFI partition (generally /dev/sda1), start a bash shell and execute
```
grub-install --bootloader-id ubuntu /dev/sda
```
.

Finally, close the shell with the exit command and re-boot.