This is still an issue in Oneiric. Here is my case:
* a computer with two hard-drives. One of the MBR of these is used to bottup normally
* I introduced a USB stick with Kubuntu 11.04, booted from USB, and upgraded to Oneiric (11.10)
After the upgrade, the MBR in the HD of the desktop computer was now damaged, it would no longer boot from HD
The fix was, as usual, to boot the HD partition from the USB's Grub, and then run grub-install /dev/sdX , where X was the appropriate value (either a or b).
This is still an issue in Oneiric. Here is my case:
* a computer with two hard-drives. One of the MBR of these is used to bottup normally
* I introduced a USB stick with Kubuntu 11.04, booted from USB, and upgraded to Oneiric (11.10)
After the upgrade, the MBR in the HD of the desktop computer was now damaged, it would no longer boot from HD
The fix was, as usual, to boot the HD partition from the USB's Grub, and then run grub-install /dev/sdX , where X was the appropriate value (either a or b).