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MacBook does not recognize Ubuntu external drive

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I am a newbie to Ubuntu and I want to install Ubuntu on an external drive (Samsung T7) so that I can boot Ubuntu when connecting the drive to either my Windows PC or Mac laptop. After spending several hours I've made it work properly on Windows. The PC is now able to boot Ubuntu when I connect it to the drive. But it doesn't work when I connect to MacBook. The Mac doesn't recognize the external drive as start-up disk, the disk appears on Disk Utility but I can mount it to run the EFI. The message is:

Volume on disk4 failed to mount
Perhaps the operation is not supported (kDAReturnUnsupported)
If you think the volume is supported but damaged, try the "readOnly" option
Is there any way to boot the Ubuntu?

Stat: Drive: Samsung T7 SSD, Ubuntu 18.04 LTS, MacBook M1

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