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Debian 10 grub error: no such device


This week, on 26 Feb
I did apt-get upgrade and 
apt-get dist-upgrade
then it displayed me a blue window with a prompt to install grub, because it can't find it. I pressed 'cancel', because I was a bit wonder.
My previous successful upgrade was 8 Jan 2019.

Is this a known issue? Why it doesn't see my device?

Maybe I have missed something - any warnings in Debian mailing lists, etc. that I must read before doing an upgrade?

Now I have in grub-emu:

error: no such device: dff08b74-3e1a-46b2-aef7-d1c77b14d098.
Loading Linux 4.19.0-2-amd64 ...
error: can't find command `linux'.
Loading initial ramdisk ...
error: can't find command `initrd'.

Press any key to continue...

  Failed to boot both default and fallback entries.

Best regards!
Igor Kovalchuk