Currently my hard-drive is set to MBR and I want to change it to GPT which will naturally entail wiping of the hard-drive. I want to keep my Ubuntu install for which I plan to follow Official Ubuntu /home migration guide to transfer my /home to my external drive but as I understand it will cause permission problems if set as /home mount in my new Ubuntu installation since the new user's ID will not be the same as the current one. I've also looked at this excellent answer but it still leaves me with the user permissions question. How can I migrate to a new OS on the same machine without having to worry about user permissions?
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