Comment 30 for bug 222126

The detailed tests in my previous post confirm that the 810 parted is not updating the MBR with the partition information needed by apple intel macs, resulting in the bug.

I repeat here my proposed solution, which was at the end.

Solution:

The refit package should be part of the installation, and a user option provided after partitioning to sync MBR for intel mac MBR loaders. (Not necessary for efi/gpt loaders).
This will improve the install/restart experience for intel apple mac users.
It will still be necessary to run gptsync after any re-partitioning.

But preferably revert to the previous partitioner version for apple intel macs, unless there are good reasons not to do so.