Comment 1 for bug 429979

VERY DANGEROUS OVERWRITES MBR WITHOUT WARNING !!

I installed Karmic Koala Ubunutu 9.10 from the live CD icon on a MACBOOK PRO 13".
I choose to install on and 8GB SD card (sdb) and used "manual partion" to set up sda1 as an ext3
mounted as "/".
Everything went fine until the very end when ubiguity said "installing GRUB on hd(0,0)
(which would be sda the harddrive) wihtout any question.

When i rebooted i could not reboot into OSX. I had to pulls some undocumented OSX
rescue tricks to get my OSX back working. This should never have happend grub should
have been installed on sdb or i schould have been asked.

link to help forum entry:
http://ubuntuforums.org/showthread.php?t=1306837