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I ran an experiment. I had one hard drive with Ubuntu and one hard drive with Windows. Either drive boots when the drive is selected in BIOS. When Ubuntu boots, I see the option for Windows. I select it and it gives some kind or error, but then boots Windows. Anybody familiar with this?

Try this. Boot into linux then run this command in a terminal -

sudo update-grub

That worked. I also had to fix the date and time.

How do you change the user name and password?

Password for Window's, Linux, or both?

This also could be a problem -

https://www.howtogeek.com/323390/how-to ... l-booting/

Linux username password.

See link -

https://linuxize.com/post/how-to-change ... -in-linux/

Try googling before asking question.