disk utility will not highlight the erase option
trying to erase my iMac for a new owner....Disk Utility will not highlight the ERASE button at the top when selecting Macintosh HD
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You can not erase the disk that you are booted from. You must startup in macOS Recovery or another disk.
To sell, give away, trade in or recycle a Mac,
see > What to do before you sell, give away, or trade in your Mac - Apple Support