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The thread suggested by FGT is a great source of information. However, be careful with the procedure. Xbolshe was the first to try something like this, at least in this community, so I would even suggest you to contact him if you run into some issue with the process. You can also check his custom images for Galileo in his GitHub link, https://github.com/xbolshe/galileo-custom-images.
I already contacted him and waiting for an answer