Another affected used. Syncing partition tables with a refit rescue cd
was able to rectify the problem. It occurred for me when I tried to
install grub to /dev/sda and to (hd0).

-- 
Partition Table is cleared during install on Intel Macs
https://bugs.launchpad.net/bugs/222126
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Support, which is the registrant for Mactel Support.

Status in grub-installer: New
Status in Mactel Support: Confirmed
Status in “parted” source package in Ubuntu: Confirmed
Status in “ubiquity” source package in Ubuntu: Confirmed

Bug description:
Binary package hint: ubiquity

Ubuntu 8.04 Final

Intel Macs have an EFI system and a GPT. The installer seems to handle the GPT 
correctly (as it has in the past), but it has recently come up that the 
installer is completely emptying the contents of the MBR partition table which 
is still required to boot Windows and Ubuntu (GRUB relies on the MBR partition 
table). The two tables are not synced automatically.

When users install Hardy, they are suprised to find that the system is 
unbootable (the EFI loader cannot "see" the partition as bootable). a tool such 
as rEFIt or gptsync can copy the information in the GPT into the MBR table thus 
fixing the issue (for most). 

This is even more serious for users with other working OS installs in addition 
to Ubuntu (such as other linux distros and Windows) since it completely dumps 
the information needed to boot these installs as well.

The expected procedure (and how the previous Ubuntu install seems to have 
handled it) is to 'update' both the GPT and the MBR table with changes instead 
of completely losing the information stored there.

gparted / parted seemed to update both tables properly previously as well.

I will be doing a full install on my iMac later and will be able to add 
additional information.

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