Help with failed upgrade to 16.04 (from 13. something)

I upgraded to Ubuntu Studio 16.04 this afternoon (I was using v. 13. something) all seemed to go well until I tried to restart. After clicking Ubuntu Low Latency, in Grub, I got the terminal window that said:

:[sdd] No caching mode found

:[sdd] Assuming drive cache write through.

I have an HP 8600 desktop... 8 GB ram, I'm doing dual boot with Windows 10, with my Linux install on an 3 TB external drive, which I believe Grub is also installed upon. I have rEfind on a flash drive that I use to switch OS's (unless there is a fresh update of grub, in which case, I go right to Grub).

When it came up, during the upgrade, I kept my present preferences, but I did have the upgrade remove what it claimed to be obsolete files...

I can still startup & use Windows.

Any suggestions or help much appreciated. Thanks in advance.

Henry

"Earth is spinning, round the sun..."

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Help with failed upgrade to 16.04 (from 13. something)