Changing partition table to MBR from GPT

Hello fellow Ubuntu MATE users,

When I woke up today I thought to myself: "Why don't I dualboot Windows Vista and Ubuntu MATE on my 10 year old PC?" I grabbed the Windows Vista ISO only to realise that I had installed Ubuntu MATE on UEFI mode. Because Windows Vista does not support EFI booting and cannot be installed on a GPT partition table, I need to change the partition table to MBR. However, I want to do it without losing any data and go through the pain of reinstalling Ubuntu MATE and copying all my backups to the 10 year old HDD( it will take at least 5 hours). Is this possible and if yes, how can I do it?


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