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I have managed to clear all my content via the utility disc, but when trying to reinstall Catalina I get the message “ The target volume is part of an incomplete system and cannot be installed to”
MacBook Air 13″, macOS 10.15
You need to erase the whole physical drive which is hidden by default with later versions of Disk Utility. Here is an Apple article with instructions for everything a person needs to do to prepare a Mac for sale:
What to do before you sell, give away, trade in, or recycle your Mac - Apple Support
Did you follow the instructions in What to do before you sell, give away, or trade in your Mac - Apple Support?
Wiping MacBook Air 2012 prior to sale
