Here is the link to the script on Github. I’ve used it twice on a rpi4+ after a fresh install of raspbian buster and setting up ssh and wifi. Took about 18 minutes from script start to completion and reboot without building mimic. After first reboot mycroft will start and you may have to use the cli interface to get the pairing code. After pairing is complete and a second reboot everything should start up and the finished booting skill should alert you that its done booting.
Note: An “error” will display during the script for both the finished booting and respeaker skill install because the skill.json file doesn’t exist yet, it can be ignored.