Ubuntu 14.04 - GRUB dual boot with W10 (formerly W7)
I have actually solved this problem but since I could not find the solution anywhere I thought it might be helpful to some to report my findings.
Deja Dup weekly backup (for the Ubuntu system) to a second internal HD started failing sometime after I upgraded W7 to W10.
The Deja Dup error message was quite long but the bottom line was that it could not find the path to the folder in which I had been saving my backups.
And I couldn't mount the second drive to examine the folders.
After much troubleshooting, I got the idea that W10 was leaving the second HD in a strange state - different than it did with W7.
It turns out that W10, by default, doesn’t do a complete shutdown - I was suspicious.
I booted into W10 and found (not easily) the place to make W10 do a full shutdown.
I changed that by unchecking the appropriate box.
I rebooted to Ubuntu and the problem seems to have been solved.
Here is the link to the question "how to fully shut down W10":
http://windowsten.info/tutorials/5767-how-to-fully-shut-down-windows-10
I used his second method because I wanted to have this happen EVERY time I shut down W10.
I hope this helps someone.
Walt
deja-dup 30.0-0ubuntu4
duplicity 0.6.23-1ubuntu4.1
Thanks for the report and the research! I'm cleaning up some old bugs and since this doesn't need any action from our end, I'll close this. Thanks.