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
/dev/sda/ with your devicename. Typically
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
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.