We did a Windows 7 -> 10 upgrade instead of a clean install and apparantly it forgot some leftovers from GPT partition after we reinstalled as MBR partition.

When I was going to make a Clonezilla image it would fail because The disk contains mismatched GPT and MBR partition: /dev/sda.

Before you proceed, make sure that you are actually using MBR partition, because we're going to remove the GPT partition.

We'll be utilizing the gdisk utility which is included on the Clonezilla live CD.
Go ahead and boot into Clonezilla command shell and type the following command:

$ sudo gdisk /dev/sda

Change /dev/sda/ with your devicename. Typically sda or hda

It will list your partition tables, you will likely see something like this:

MBR: MBR only
BSD: not present
APM: not present
GPT: present

Found valid MBR and GPT. Which do you want to use?
1 - MBR
2 - GPT
3 - Create blank GPT

Enter 1 and then for the follow-up question enter x (for extra options) and then z to zap (delete) the GPT partition.

Warning! It will ask you if you want to Blank out MBR? - it's CRUCIAL that you enter N (NO) here.

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