Ubuntu uninstall

abdulrashid wrote:

I do have a 2012 13 macbook pro

regards

Thanks.

Using the MacBook Pro, create a macOS High Sierra bootable installer: How to create a bootable installer for macOS - Apple Support. Then, follow the steps to boot to it. Once in macOS Recovery, follow these steps:

Use Disk Utility to erase an Intel-based Mac - Apple Support. When erasing your Mac, select "View" > "Show All Devices" in Disk Utility and erase the main drive. Its name will end in "Media". Make sure this information matches:

Name: Macintosh HD

Format: Mac OS Extended (Journaled)

Scheme: GUID

After erasing your startup disk, reinstall macOS: How to reinstall macOS - Apple Support.

Jack

I have read that sometimes they can be purchased on eBay. If you know someone who has a Mac with High Sierra installed, they can download the installer to a flash drive. Here is one thing you might try. Turn on the computer and then press the Command + Option +R keys to get it to startup in the Internet Recovery Mode. I have read here that his does not work on some older computers. If it works, it will enable the computer to download and install its original operating system. Then that can be upgraded if desired.

If the Ubuntu OS is totally unwanted, booting from an external OS installation flash drive will erase the disk prior to installing MacOS.

That assumes the Ubuntu Mac can be made to boot from a flash drive. I'd think so as Ubuntu had to be installed somehow from an external drive of some sort.

Please follow the steps to create a macOS bootable installer using your MacBook Pro.

Jack

I have two comments. First it would be helpful to know if you have an early or a late 2009 iMac. That will determine which operating system can be installed. A late 2009 iMac will accept the High Sierra OS. Second, you may have to purchase the disk with the OS installer on line.

Do you have access to another Mac?

Jack