If Linux is installed on your disk and you installed the Solaris OS on a separate partition, the Linux partition does not display on the GRUB menu. No error message is displayed.
Workaround: Edit the GRUB menu's menu.lst file to add Linux to the GRUB menu. Perform the following steps:
Boot the Solaris OS.
Edit the menu.lst file at /boot/grub/menu.lst. For more information, see the System Administration Guide: Basic Administration.