Thought about upgrading to WIN 11 on the other SSD, but the motherboard is over 10 years old and not capable. Need new tower and motherboard to which...
As mentioned by yancek, check the location of the Ubuntu and Microsoft boot folders.
If the boot folders are stored in the respective OS disks, then...
This is interesting. I deleted boot parameters "quiet" and "splash" on startup (to see where it was hanging up) and boot time dropped to about 2 1/2...