I started a dual-boot install at the end of the day, and now I’m in trouble and too tired to think right. After a basic default install,it only boots to mint now. No dual boot. I’m going to sleep now, but any pointers you can offer will give me a jump on my day tomorrow. Thanks.
I found it. There is a utility called “boot repair”. Fully automatic. No thinking needed. It just worked.
Thank you all for the help.