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MAC GUID USB3 Locked as Read Only: How to Change to Read/Write with Ubuntu 18? OR re-partition USB3

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( 5 months ago )

USB3 128GB Was Bootable Mac OS 10.13.6. CRASHED during WiFi update. Now locked as Read Only. 3 partitions: EFI Boot; OS 10.13.6; and OS Restore partition. Cannot access any. Cannot see during startup, but can see in Disk Utility. First Aid on 10.13.6 partition is Green (good). Can see all partitions on Ubuntu, but cannot recover or change anything due to Read Only. New to Ubuntu but am learning fast. Have gone through older and existing similar problems/solutions but no success. Thanks, steve. My data is backed-up, so if I cannot change to Read/Write how can I re-partition the entire 128GB USB3 without having access to it in Mac Disk Utility or in Ubuntu? Thanks, steve.

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