Previously, I had a problem installing Ubuntu on a Windows 7 / Ubuntu 19.04 system. For the most part, that problem has been solved and I can dual boot between the two OS.
I am encountering a problem which I do have a work-around, but I was wondering if anyone can give an explanation to the cause of this problem (and why my "solution" works).
When I start up the computer, I get an error message that says the following:
Attempting boot from hard disk
Error: No such device: [UUID of the Ubuntu filesystem]
Error: Unknown filesystem.
Entering rescue mode...
grub rescue>
I figured out by accident that I can solve this problem by inserting a bootable Boot Repair disk. All I have to do is boot to it and get to its grub message. I don't need to choose "Boot Repair -- Disk session" or perform any kind of repair. Then, I take the USB drive out, restart the computer and the original grub menu appears, showing my Ubuntu and Windows systems. I can choose either one to boot to from here.
I don't quite understand why this works. I haven't done anything with the Boot Repair disk other than start from it. But it does something so that the next time I boot with it, everything works.
(At this point, I could continue to use Boot Repair to attempt to "fix" it, but I worry that it will make it worse. While my current situation is bizarre, there is a way to get my system back each and every time. So, I'm hesitant to try something unless someone can give me a reason why it should work.)
Anyway, any suggestions would be appreciated!
Edit:
Here is the boot-repair report. I can't see anything obviously wrong, but I'm not good at understanding the report.
