There is no single solution to the problem, currently. As one developer told us, “it’s a bit hit and miss”. The net result is that, depending on which version of macOS you’re running and whether you have an Intel or Apple silicon Mac, bootable clones don’t always work. That means that the old way of creating bootable clones no longer works and developers have had to find ways to work with and around Apple’s new way of doing things. Copies of the Signed System Volume are not bootable without a cryptographic seal applied by Apple. One example of this is the introduction of the Signed System Volume in Big Sur. One of the consequences of those changes is that is harder for third-party applications that need deep access to the system to work.
However, over the last few versions of macOS Apple has been making changes to make it more secure. Some apps are focused on creating clones of your hard drive and offer incremental backup as an extra feature. Apple’s own Time Machine, which is included with macOS, is an example of this kind of solution. Try making a fresh table, and using Parted's rescue feature to recover partitions.Warning: The driver descriptor says the physical block size is 2048 bytes, but Linux says it is 512 bytes.All these warnings are safe to ignore, and your drive should be able to boot without any problems.Refer to the following message from Ubuntu's mailing list if you want to learn more.Many options are focused solely on making backing up your Mac regularly as easy as as possible. Is this a GPT partition table? Both the primary and backup GPT tables are corrupt. Or perhaps you deleted the GPT table, and are now using an msdos partition table. Perhaps it was corrupted - possibly by a program that doesn't understand GPT partition tables.
However, it does not have a valid fake msdos partition table, as it should. Ubuntu images (and potentially some other related GNU/Linux distributions) have a peculiar format that allows the image to boot without any further modification from both CDs and USB drives.A consequence of this enhancement is that some programs, like parted get confused about the drive's format and partition table, printing warnings such as:/dev/xxx contains GPT signatures, indicating that it has a GPT table.
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