I have Windows XP dual boot with Ubuntu 8.10 on my system. I brought in a portable HDD on which I installed Ubuntu 10.04 32-bit. The grub boot loader was installed along with this and to boot windows, I've had to plug in the HDD (with lucid install) everytime. It had been working fine. Until few hours back when I decided to put Ubuntu 10.04 amd64 install on this portable HDD.
I chose the option - Erase complete drive and install Ubuntu10.04 - and install went alright. Now when the system restarted, it failed to boot up and I receive the grub rescue prompt.
I've tried to reinstall grub using references given in posts in various forums but boot menu has not come up till now.