x86: Installing GRUB Legacy on a System That Has GRUB 2 Installed
Because the system does not automatically reinstall the GRUB Legacy boot loader when you destroy the last GRUB 2 boot environment, if you want to reinstall the GRUB Legacy boot loader, you must first boot to the latest boot environment that includes the GRUB Legacy boot loader files (in /boot/grub/stage1 and /boot/grub/stage2).
The installgrub command is deprecated in this release and should only be used if you are running a release that supports the GRUB Legacy boot loader. See installgrub(1M).
x86: How to Install GRUB Legacy on a System That Has GRUB 2 Installed
The following procedure applies if you have upgraded your system from a release that supports GRUB Legacy to Oracle Solaris 11.2.
If you decide to revert your system to the older GRUB Legacy boot loader, use the following procedure.
 | Caution - Be sure to perform these steps from the boot environment that contains the Oracle Solaris release or a Support Repository Update (SRU) that you used to update to Oracle Solaris 11.2. Additionally, if you have upgraded the ZFS pool's capabilities by using the zpool upgrade command past version 33, you will not be able to downgrade to GRUB Legacy or complete Step 2 of this procedure. Forcibly downgrading to GRUB Legacy after the root pool has been upgraded past version 33 results in an unbootable system. |
- Assume the root role.
See Using Your Assigned Administrative Rights in Securing Users and Processes in Oracle Solaris 11.2 .
- Boot from the boot environment that was upgraded to the Oracle Solaris 11.2 release.
- Remove all of the GRUB 2 boot environments from the system by
using the beadm destroy command. See Destroying a Boot Environment in Creating and Administering Oracle Solaris 11.2 Boot Environments
.
Performing this step ensures that you do not accidentally activate and install GRUB 2, as activating any boot environments that include the Oracle Solaris 11.2 release will replace the Legacy GRUB boot loader with GRUB 2.
- On the boot environment that contains the latest GRUB Legacy version,
forcibly reinstall GRUB Legacy on the system, as follows:
# bootadm install-bootloader -f
Note - You do not need to reboot after these steps. On the next full reboot, the GRUB Legacy boot loader will execute.